import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;

public class Main {

    static Reader reader = new Reader();
    static PrintWriter writer = new PrintWriter(System.out);

    public static void main(String[] args) throws IOException {
        int n = reader.nextInt();
        int[] h = reader.nextIntArray(n);
        int[] cost = new int[n];
        cost[0] = 0;
        cost[1] = Math.abs(h[0] - h[1]);
        for (int i = 2; i < n; i++) {
            cost[i] = Math.min(
                    cost[i - 2] + Math.abs(h[i] - h[i - 2]),
                    cost[i - 1] + Math.abs(h[i] - h[i - 1])
            );
        }
        writer.println(cost[n - 1]);
        writer.flush();
    }


    public static class Reader {
        final private int BUFFER_SIZE = 1 << 16;
        private DataInputStream din;
        private byte[] buffer;
        private int bufferPointer, bytesRead;

        public Reader() {
            din = new DataInputStream(System.in);
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public Reader(String file_name) throws IOException {
            din = new DataInputStream(new FileInputStream(file_name));
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public String readLine() throws IOException {
            byte[] buf = new byte[1000000 + 1]; // line length
            int cnt = 0, c;
            while ((c = read()) != -1) {
                if (c == '\n')
                    break;
                buf[cnt++] = (byte) c;
            }
            return new String(buf, 0, cnt);
        }

        public int nextInt() throws IOException {
            int ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (neg)
                return -ret;
            return ret;
        }

        public long nextLong() throws IOException {
            long ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');
            if (neg)
                return -ret;
            return ret;
        }

        public double nextDouble() throws IOException {
            double ret = 0, div = 1;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();

            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (c == '.') {
                while ((c = read()) >= '0' && c <= '9') {
                    ret += (c - '0') / (div *= 10);
                }
            }

            if (neg)
                return -ret;
            return ret;
        }

        private void fillBuffer() throws IOException {
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
            if (bytesRead == -1)
                buffer[0] = -1;
        }

        private byte read() throws IOException {
            if (bufferPointer == bytesRead)
                fillBuffer();
            return buffer[bufferPointer++];
        }

        public void close() throws IOException {
            if (din == null)
                return;
            din.close();
        }

        public int[] nextIntArray(int n) throws IOException {
            int[] arr = new int[n];
            for (int i = 0; i < n; i++) {
                arr[i] = nextInt();
            }
            return arr;
        }

        public long[] nextLongArray(int n) throws IOException {
            long[] arr = new long[n];
            for (int i = 0; i < n; i++) {
                arr[i] = nextLong();
            }
            return arr;
        }

        public int[][] nextInt2DArray(int m, int n) throws IOException {
            int[][] arr = new int[m][n];
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            }
            return arr;
        }

        public long[][] nextInt2DArrayL(int m, int n) throws IOException {
            long[][] arr = new long[m][n];
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            }
            return arr;
        }
        // kickstart - Solution
        // atcoder - Main
    }
} import java.io.DataInputStream; DataInputStream java.io import java.io.FileInputStream; FileInputStream java.io import java.io.IOException; IOException java.io import java.io.PrintWriter; PrintWriter java.io public class Main {

    static Reader reader = new Reader();
    static PrintWriter writer = new PrintWriter(System.out);

    public static void main(String[] args) throws IOException {
        int n = reader.nextInt();
        int[] h = reader.nextIntArray(n);
        int[] cost = new int[n];
        cost[0] = 0;
        cost[1] = Math.abs(h[0] - h[1]);
        for (int i = 2; i < n; i++) {
            cost[i] = Math.min(
                    cost[i - 2] + Math.abs(h[i] - h[i - 2]),
                    cost[i - 1] + Math.abs(h[i] - h[i - 1])
            );
        }
        writer.println(cost[n - 1]);
        writer.flush();
    }


    public static class Reader {
        final private int BUFFER_SIZE = 1 << 16;
        private DataInputStream din;
        private byte[] buffer;
        private int bufferPointer, bytesRead;

        public Reader() {
            din = new DataInputStream(System.in);
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public Reader(String file_name) throws IOException {
            din = new DataInputStream(new FileInputStream(file_name));
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public String readLine() throws IOException {
            byte[] buf = new byte[1000000 + 1]; // line length
            int cnt = 0, c;
            while ((c = read()) != -1) {
                if (c == '\n')
                    break;
                buf[cnt++] = (byte) c;
            }
            return new String(buf, 0, cnt);
        }

        public int nextInt() throws IOException {
            int ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (neg)
                return -ret;
            return ret;
        }

        public long nextLong() throws IOException {
            long ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');
            if (neg)
                return -ret;
            return ret;
        }

        public double nextDouble() throws IOException {
            double ret = 0, div = 1;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();

            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (c == '.') {
                while ((c = read()) >= '0' && c <= '9') {
                    ret += (c - '0') / (div *= 10);
                }
            }

            if (neg)
                return -ret;
            return ret;
        }

        private void fillBuffer() throws IOException {
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
            if (bytesRead == -1)
                buffer[0] = -1;
        }

        private byte read() throws IOException {
            if (bufferPointer == bytesRead)
                fillBuffer();
            return buffer[bufferPointer++];
        }

        public void close() throws IOException {
            if (din == null)
                return;
            din.close();
        }

        public int[] nextIntArray(int n) throws IOException {
            int[] arr = new int[n];
            for (int i = 0; i < n; i++) {
                arr[i] = nextInt();
            }
            return arr;
        }

        public long[] nextLongArray(int n) throws IOException {
            long[] arr = new long[n];
            for (int i = 0; i < n; i++) {
                arr[i] = nextLong();
            }
            return arr;
        }

        public int[][] nextInt2DArray(int m, int n) throws IOException {
            int[][] arr = new int[m][n];
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            }
            return arr;
        }

        public long[][] nextInt2DArrayL(int m, int n) throws IOException {
            long[][] arr = new long[m][n];
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            }
            return arr;
        }
        // kickstart - Solution
        // atcoder - Main
    }
} Main static Reader reader = new Reader(); reader new Reader() static PrintWriter writer = new PrintWriter(System.out); writer new PrintWriter(System.out) public static void main(String[] args) throws IOException {
        int n = reader.nextInt();
        int[] h = reader.nextIntArray(n);
        int[] cost = new int[n];
        cost[0] = 0;
        cost[1] = Math.abs(h[0] - h[1]);
        for (int i = 2; i < n; i++) {
            cost[i] = Math.min(
                    cost[i - 2] + Math.abs(h[i] - h[i - 2]),
                    cost[i - 1] + Math.abs(h[i] - h[i - 1])
            );
        }
        writer.println(cost[n - 1]);
        writer.flush();
    } main {
        int n = reader.nextInt();
        int[] h = reader.nextIntArray(n);
        int[] cost = new int[n];
        cost[0] = 0;
        cost[1] = Math.abs(h[0] - h[1]);
        for (int i = 2; i < n; i++) {
            cost[i] = Math.min(
                    cost[i - 2] + Math.abs(h[i] - h[i - 2]),
                    cost[i - 1] + Math.abs(h[i] - h[i - 1])
            );
        }
        writer.println(cost[n - 1]);
        writer.flush();
    } int n = reader.nextInt(); n reader.nextInt() reader.nextInt reader int[] h = reader.nextIntArray(n); h reader.nextIntArray(n) reader.nextIntArray reader n int[] cost = new int[n]; cost new int[n] n cost[0] = 0 cost[0] cost 0 0 cost[1] = Math.abs(h[0] - h[1]) cost[1] cost 1 Math.abs(h[0] - h[1]) Math.abs Math h[0] - h[1] h[0] h 0 h[1] h 1 for (int i = 2; i < n; i++) {
            cost[i] = Math.min(
                    cost[i - 2] + Math.abs(h[i] - h[i - 2]),
                    cost[i - 1] + Math.abs(h[i] - h[i - 1])
            );
        } int i = 2; int i = 2; i 2 i < n i n i++ i++ i {
            cost[i] = Math.min(
                    cost[i - 2] + Math.abs(h[i] - h[i - 2]),
                    cost[i - 1] + Math.abs(h[i] - h[i - 1])
            );
        } {
            cost[i] = Math.min(
                    cost[i - 2] + Math.abs(h[i] - h[i - 2]),
                    cost[i - 1] + Math.abs(h[i] - h[i - 1])
            );
        } cost[i] = Math.min(
                    cost[i - 2] + Math.abs(h[i] - h[i - 2]),
                    cost[i - 1] + Math.abs(h[i] - h[i - 1])
            ) cost[i] cost i Math.min(
                    cost[i - 2] + Math.abs(h[i] - h[i - 2]),
                    cost[i - 1] + Math.abs(h[i] - h[i - 1])
            ) Math.min Math cost[i - 2] + Math.abs(h[i] - h[i - 2]) cost[i - 2] cost i - 2 i 2 Math.abs(h[i] - h[i - 2]) Math.abs Math h[i] - h[i - 2] h[i] h i h[i - 2] h i - 2 i 2 cost[i - 1] + Math.abs(h[i] - h[i - 1]) cost[i - 1] cost i - 1 i 1 Math.abs(h[i] - h[i - 1]) Math.abs Math h[i] - h[i - 1] h[i] h i h[i - 1] h i - 1 i 1 writer.println(cost[n - 1]) writer.println writer cost[n - 1] cost n - 1 n 1 writer.flush() writer.flush writer String[] args args public static class Reader {
        final private int BUFFER_SIZE = 1 << 16;
        private DataInputStream din;
        private byte[] buffer;
        private int bufferPointer, bytesRead;

        public Reader() {
            din = new DataInputStream(System.in);
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public Reader(String file_name) throws IOException {
            din = new DataInputStream(new FileInputStream(file_name));
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public String readLine() throws IOException {
            byte[] buf = new byte[1000000 + 1]; // line length
            int cnt = 0, c;
            while ((c = read()) != -1) {
                if (c == '\n')
                    break;
                buf[cnt++] = (byte) c;
            }
            return new String(buf, 0, cnt);
        }

        public int nextInt() throws IOException {
            int ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (neg)
                return -ret;
            return ret;
        }

        public long nextLong() throws IOException {
            long ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');
            if (neg)
                return -ret;
            return ret;
        }

        public double nextDouble() throws IOException {
            double ret = 0, div = 1;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();

            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (c == '.') {
                while ((c = read()) >= '0' && c <= '9') {
                    ret += (c - '0') / (div *= 10);
                }
            }

            if (neg)
                return -ret;
            return ret;
        }

        private void fillBuffer() throws IOException {
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
            if (bytesRead == -1)
                buffer[0] = -1;
        }

        private byte read() throws IOException {
            if (bufferPointer == bytesRead)
                fillBuffer();
            return buffer[bufferPointer++];
        }

        public void close() throws IOException {
            if (din == null)
                return;
            din.close();
        }

        public int[] nextIntArray(int n) throws IOException {
            int[] arr = new int[n];
            for (int i = 0; i < n; i++) {
                arr[i] = nextInt();
            }
            return arr;
        }

        public long[] nextLongArray(int n) throws IOException {
            long[] arr = new long[n];
            for (int i = 0; i < n; i++) {
                arr[i] = nextLong();
            }
            return arr;
        }

        public int[][] nextInt2DArray(int m, int n) throws IOException {
            int[][] arr = new int[m][n];
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            }
            return arr;
        }

        public long[][] nextInt2DArrayL(int m, int n) throws IOException {
            long[][] arr = new long[m][n];
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            }
            return arr;
        }
        // kickstart - Solution
        // atcoder - Main
    } Reader final private int BUFFER_SIZE = 1 << 16; BUFFER_SIZE 1 << 16 1 16 private DataInputStream din; din private byte[] buffer; buffer private int bufferPointer bufferPointer bytesRead; bytesRead public Reader() {
            din = new DataInputStream(System.in);
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        } Reader {
            din = new DataInputStream(System.in);
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        } din = new DataInputStream(System.in) din new DataInputStream(System.in) buffer = new byte[BUFFER_SIZE] buffer new byte[BUFFER_SIZE] BUFFER_SIZE bufferPointer = bytesRead = 0 bufferPointer bytesRead = 0 bytesRead 0 public Reader(String file_name) throws IOException {
            din = new DataInputStream(new FileInputStream(file_name));
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        } Reader {
            din = new DataInputStream(new FileInputStream(file_name));
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        } din = new DataInputStream(new FileInputStream(file_name)) din new DataInputStream(new FileInputStream(file_name)) buffer = new byte[BUFFER_SIZE] buffer new byte[BUFFER_SIZE] BUFFER_SIZE bufferPointer = bytesRead = 0 bufferPointer bytesRead = 0 bytesRead 0 String file_name file_name public String readLine() throws IOException {
            byte[] buf = new byte[1000000 + 1]; // line length
            int cnt = 0, c;
            while ((c = read()) != -1) {
                if (c == '\n')
                    break;
                buf[cnt++] = (byte) c;
            }
            return new String(buf, 0, cnt);
        } readLine {
            byte[] buf = new byte[1000000 + 1]; // line length
            int cnt = 0, c;
            while ((c = read()) != -1) {
                if (c == '\n')
                    break;
                buf[cnt++] = (byte) c;
            }
            return new String(buf, 0, cnt);
        } byte[] buf = new byte[1000000 + 1]; buf new byte[1000000 + 1] 1000000 + 1 1000000 1 int cnt = 0 cnt 0 c; c while ((c = read()) != -1) {
                if (c == '\n')
                    break;
                buf[cnt++] = (byte) c;
            } (c = read()) != -1 (c = read()) c read() read -1 1 {
                if (c == '\n')
                    break;
                buf[cnt++] = (byte) c;
            } if (c == '\n')
                    break; c == '\n' c '\n' break; buf[cnt++] = (byte) c buf[cnt++] buf cnt++ cnt (byte) c return new String(buf, 0, cnt); new String(buf, 0, cnt) public int nextInt() throws IOException {
            int ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (neg)
                return -ret;
            return ret;
        } nextInt {
            int ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (neg)
                return -ret;
            return ret;
        } int ret = 0; ret 0 byte c = read(); c read() read while (c <= ' ')
                c = read(); c <= ' ' c ' ' c = read() c read() read boolean neg = (c == '-'); neg (c == '-') c '-' if (neg)
                c = read(); neg c = read() c read() read do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9'); (c = read()) >= '0' && c <= '9' (c = read()) >= '0' (c = read()) c read() read '0' c <= '9' c '9' {
                ret = ret * 10 + c - '0';
            } ret = ret * 10 + c - '0' ret ret * 10 + c - '0' ret * 10 + c ret * 10 ret 10 c '0' if (neg)
                return -ret; neg return -ret; -ret ret return ret; ret public long nextLong() throws IOException {
            long ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');
            if (neg)
                return -ret;
            return ret;
        } nextLong {
            long ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');
            if (neg)
                return -ret;
            return ret;
        } long ret = 0; ret 0 byte c = read(); c read() read while (c <= ' ')
                c = read(); c <= ' ' c ' ' c = read() c read() read boolean neg = (c == '-'); neg (c == '-') c '-' if (neg)
                c = read(); neg c = read() c read() read do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9'); (c = read()) >= '0' && c <= '9' (c = read()) >= '0' (c = read()) c read() read '0' c <= '9' c '9' {
                ret = ret * 10 + c - '0';
            } ret = ret * 10 + c - '0' ret ret * 10 + c - '0' ret * 10 + c ret * 10 ret 10 c '0' if (neg)
                return -ret; neg return -ret; -ret ret return ret; ret public double nextDouble() throws IOException {
            double ret = 0, div = 1;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();

            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (c == '.') {
                while ((c = read()) >= '0' && c <= '9') {
                    ret += (c - '0') / (div *= 10);
                }
            }

            if (neg)
                return -ret;
            return ret;
        } nextDouble {
            double ret = 0, div = 1;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();

            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (c == '.') {
                while ((c = read()) >= '0' && c <= '9') {
                    ret += (c - '0') / (div *= 10);
                }
            }

            if (neg)
                return -ret;
            return ret;
        } double ret = 0 ret 0 div = 1; div 1 byte c = read(); c read() read while (c <= ' ')
                c = read(); c <= ' ' c ' ' c = read() c read() read boolean neg = (c == '-'); neg (c == '-') c '-' if (neg)
                c = read(); neg c = read() c read() read do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9'); (c = read()) >= '0' && c <= '9' (c = read()) >= '0' (c = read()) c read() read '0' c <= '9' c '9' {
                ret = ret * 10 + c - '0';
            } ret = ret * 10 + c - '0' ret ret * 10 + c - '0' ret * 10 + c ret * 10 ret 10 c '0' if (c == '.') {
                while ((c = read()) >= '0' && c <= '9') {
                    ret += (c - '0') / (div *= 10);
                }
            } c == '.' c '.' {
                while ((c = read()) >= '0' && c <= '9') {
                    ret += (c - '0') / (div *= 10);
                }
            } while ((c = read()) >= '0' && c <= '9') {
                    ret += (c - '0') / (div *= 10);
                } (c = read()) >= '0' && c <= '9' (c = read()) >= '0' (c = read()) c read() read '0' c <= '9' c '9' {
                    ret += (c - '0') / (div *= 10);
                } ret += (c - '0') / (div *= 10) ret (c - '0') / (div *= 10) (c - '0') c '0' (div *= 10) div 10 if (neg)
                return -ret; neg return -ret; -ret ret return ret; ret private void fillBuffer() throws IOException {
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
            if (bytesRead == -1)
                buffer[0] = -1;
        } fillBuffer {
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
            if (bytesRead == -1)
                buffer[0] = -1;
        } bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE) bytesRead din.read(buffer, bufferPointer = 0, BUFFER_SIZE) din.read din buffer bufferPointer = 0 bufferPointer 0 BUFFER_SIZE if (bytesRead == -1)
                buffer[0] = -1; bytesRead == -1 bytesRead -1 1 buffer[0] = -1 buffer[0] buffer 0 -1 1 private byte read() throws IOException {
            if (bufferPointer == bytesRead)
                fillBuffer();
            return buffer[bufferPointer++];
        } read {
            if (bufferPointer == bytesRead)
                fillBuffer();
            return buffer[bufferPointer++];
        } if (bufferPointer == bytesRead)
                fillBuffer(); bufferPointer == bytesRead bufferPointer bytesRead fillBuffer() fillBuffer return buffer[bufferPointer++]; buffer[bufferPointer++] buffer bufferPointer++ bufferPointer public void close() throws IOException {
            if (din == null)
                return;
            din.close();
        } close {
            if (din == null)
                return;
            din.close();
        } if (din == null)
                return; din == null din null return; din.close() din.close din public int[] nextIntArray(int n) throws IOException {
            int[] arr = new int[n];
            for (int i = 0; i < n; i++) {
                arr[i] = nextInt();
            }
            return arr;
        } nextIntArray {
            int[] arr = new int[n];
            for (int i = 0; i < n; i++) {
                arr[i] = nextInt();
            }
            return arr;
        } int[] arr = new int[n]; arr new int[n] n for (int i = 0; i < n; i++) {
                arr[i] = nextInt();
            } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
                arr[i] = nextInt();
            } {
                arr[i] = nextInt();
            } arr[i] = nextInt() arr[i] arr i nextInt() nextInt return arr; arr int n n public long[] nextLongArray(int n) throws IOException {
            long[] arr = new long[n];
            for (int i = 0; i < n; i++) {
                arr[i] = nextLong();
            }
            return arr;
        } nextLongArray {
            long[] arr = new long[n];
            for (int i = 0; i < n; i++) {
                arr[i] = nextLong();
            }
            return arr;
        } long[] arr = new long[n]; arr new long[n] n for (int i = 0; i < n; i++) {
                arr[i] = nextLong();
            } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
                arr[i] = nextLong();
            } {
                arr[i] = nextLong();
            } arr[i] = nextLong() arr[i] arr i nextLong() nextLong return arr; arr int n n public int[][] nextInt2DArray(int m, int n) throws IOException {
            int[][] arr = new int[m][n];
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            }
            return arr;
        } nextInt2DArray {
            int[][] arr = new int[m][n];
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            }
            return arr;
        } int[][] arr = new int[m][n]; arr new int[m][n] m n for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            } int i = 0; int i = 0; i 0 i < m i m i++ i++ i {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            } {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            } for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt(); int j = 0; int j = 0; j 0 j < n j n j++ j++ j arr[i][j] = nextInt(); arr[i][j] = nextInt() arr[i][j] arr[i] arr i j nextInt() nextInt return arr; arr int m m int n n public long[][] nextInt2DArrayL(int m, int n) throws IOException {
            long[][] arr = new long[m][n];
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            }
            return arr;
        } nextInt2DArrayL {
            long[][] arr = new long[m][n];
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            }
            return arr;
        } long[][] arr = new long[m][n]; arr new long[m][n] m n for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            } int i = 0; int i = 0; i 0 i < m i m i++ i++ i {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            } {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            } for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt(); int j = 0; int j = 0; j 0 j < n j n j++ j++ j arr[i][j] = nextInt(); arr[i][j] = nextInt() arr[i][j] arr[i] arr i j nextInt() nextInt return arr; arr int m m int n n public class Main {

    static Reader reader = new Reader();
    static PrintWriter writer = new PrintWriter(System.out);

    public static void main(String[] args) throws IOException {
        int n = reader.nextInt();
        int[] h = reader.nextIntArray(n);
        int[] cost = new int[n];
        cost[0] = 0;
        cost[1] = Math.abs(h[0] - h[1]);
        for (int i = 2; i < n; i++) {
            cost[i] = Math.min(
                    cost[i - 2] + Math.abs(h[i] - h[i - 2]),
                    cost[i - 1] + Math.abs(h[i] - h[i - 1])
            );
        }
        writer.println(cost[n - 1]);
        writer.flush();
    }


    public static class Reader {
        final private int BUFFER_SIZE = 1 << 16;
        private DataInputStream din;
        private byte[] buffer;
        private int bufferPointer, bytesRead;

        public Reader() {
            din = new DataInputStream(System.in);
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public Reader(String file_name) throws IOException {
            din = new DataInputStream(new FileInputStream(file_name));
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public String readLine() throws IOException {
            byte[] buf = new byte[1000000 + 1]; // line length
            int cnt = 0, c;
            while ((c = read()) != -1) {
                if (c == '\n')
                    break;
                buf[cnt++] = (byte) c;
            }
            return new String(buf, 0, cnt);
        }

        public int nextInt() throws IOException {
            int ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (neg)
                return -ret;
            return ret;
        }

        public long nextLong() throws IOException {
            long ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');
            if (neg)
                return -ret;
            return ret;
        }

        public double nextDouble() throws IOException {
            double ret = 0, div = 1;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();

            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (c == '.') {
                while ((c = read()) >= '0' && c <= '9') {
                    ret += (c - '0') / (div *= 10);
                }
            }

            if (neg)
                return -ret;
            return ret;
        }

        private void fillBuffer() throws IOException {
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
            if (bytesRead == -1)
                buffer[0] = -1;
        }

        private byte read() throws IOException {
            if (bufferPointer == bytesRead)
                fillBuffer();
            return buffer[bufferPointer++];
        }

        public void close() throws IOException {
            if (din == null)
                return;
            din.close();
        }

        public int[] nextIntArray(int n) throws IOException {
            int[] arr = new int[n];
            for (int i = 0; i < n; i++) {
                arr[i] = nextInt();
            }
            return arr;
        }

        public long[] nextLongArray(int n) throws IOException {
            long[] arr = new long[n];
            for (int i = 0; i < n; i++) {
                arr[i] = nextLong();
            }
            return arr;
        }

        public int[][] nextInt2DArray(int m, int n) throws IOException {
            int[][] arr = new int[m][n];
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            }
            return arr;
        }

        public long[][] nextInt2DArrayL(int m, int n) throws IOException {
            long[][] arr = new long[m][n];
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            }
            return arr;
        }
        // kickstart - Solution
        // atcoder - Main
    }
} public class Main {

    static Reader reader = new Reader();
    static PrintWriter writer = new PrintWriter(System.out);

    public static void main(String[] args) throws IOException {
        int n = reader.nextInt();
        int[] h = reader.nextIntArray(n);
        int[] cost = new int[n];
        cost[0] = 0;
        cost[1] = Math.abs(h[0] - h[1]);
        for (int i = 2; i < n; i++) {
            cost[i] = Math.min(
                    cost[i - 2] + Math.abs(h[i] - h[i - 2]),
                    cost[i - 1] + Math.abs(h[i] - h[i - 1])
            );
        }
        writer.println(cost[n - 1]);
        writer.flush();
    }


    public static class Reader {
        final private int BUFFER_SIZE = 1 << 16;
        private DataInputStream din;
        private byte[] buffer;
        private int bufferPointer, bytesRead;

        public Reader() {
            din = new DataInputStream(System.in);
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public Reader(String file_name) throws IOException {
            din = new DataInputStream(new FileInputStream(file_name));
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public String readLine() throws IOException {
            byte[] buf = new byte[1000000 + 1]; // line length
            int cnt = 0, c;
            while ((c = read()) != -1) {
                if (c == '\n')
                    break;
                buf[cnt++] = (byte) c;
            }
            return new String(buf, 0, cnt);
        }

        public int nextInt() throws IOException {
            int ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (neg)
                return -ret;
            return ret;
        }

        public long nextLong() throws IOException {
            long ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');
            if (neg)
                return -ret;
            return ret;
        }

        public double nextDouble() throws IOException {
            double ret = 0, div = 1;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();

            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (c == '.') {
                while ((c = read()) >= '0' && c <= '9') {
                    ret += (c - '0') / (div *= 10);
                }
            }

            if (neg)
                return -ret;
            return ret;
        }

        private void fillBuffer() throws IOException {
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
            if (bytesRead == -1)
                buffer[0] = -1;
        }

        private byte read() throws IOException {
            if (bufferPointer == bytesRead)
                fillBuffer();
            return buffer[bufferPointer++];
        }

        public void close() throws IOException {
            if (din == null)
                return;
            din.close();
        }

        public int[] nextIntArray(int n) throws IOException {
            int[] arr = new int[n];
            for (int i = 0; i < n; i++) {
                arr[i] = nextInt();
            }
            return arr;
        }

        public long[] nextLongArray(int n) throws IOException {
            long[] arr = new long[n];
            for (int i = 0; i < n; i++) {
                arr[i] = nextLong();
            }
            return arr;
        }

        public int[][] nextInt2DArray(int m, int n) throws IOException {
            int[][] arr = new int[m][n];
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            }
            return arr;
        }

        public long[][] nextInt2DArrayL(int m, int n) throws IOException {
            long[][] arr = new long[m][n];
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            }
            return arr;
        }
        // kickstart - Solution
        // atcoder - Main
    }
} Main
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;

public class Main {

    static Reader reader = new Reader();
    static PrintWriter writer = new PrintWriter(System.out);

    public static void main(String[] args) throws IOException {
        int n = reader.nextInt();
        int[] h = reader.nextIntArray(n);
        int[] cost = new int[n];
        cost[0] = 0;
        cost[1] = Math.abs(h[0] - h[1]);
        for (int i = 2; i < n; i++) {
            cost[i] = Math.min(
                    cost[i - 2] + Math.abs(h[i] - h[i - 2]),
                    cost[i - 1] + Math.abs(h[i] - h[i - 1])
            );
        }
        writer.println(cost[n - 1]);
        writer.flush();
    }


    public static class Reader {
        final private int BUFFER_SIZE = 1 << 16;
        private DataInputStream din;
        private byte[] buffer;
        private int bufferPointer, bytesRead;

        public Reader() {
            din = new DataInputStream(System.in);
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public Reader(String file_name) throws IOException {
            din = new DataInputStream(new FileInputStream(file_name));
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public String readLine() throws IOException {
            byte[] buf = new byte[1000000 + 1]; // line length
            int cnt = 0, c;
            while ((c = read()) != -1) {
                if (c == '\n')
                    break;
                buf[cnt++] = (byte) c;
            }
            return new String(buf, 0, cnt);
        }

        public int nextInt() throws IOException {
            int ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (neg)
                return -ret;
            return ret;
        }

        public long nextLong() throws IOException {
            long ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');
            if (neg)
                return -ret;
            return ret;
        }

        public double nextDouble() throws IOException {
            double ret = 0, div = 1;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();

            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (c == '.') {
                while ((c = read()) >= '0' && c <= '9') {
                    ret += (c - '0') / (div *= 10);
                }
            }

            if (neg)
                return -ret;
            return ret;
        }

        private void fillBuffer() throws IOException {
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
            if (bytesRead == -1)
                buffer[0] = -1;
        }

        private byte read() throws IOException {
            if (bufferPointer == bytesRead)
                fillBuffer();
            return buffer[bufferPointer++];
        }

        public void close() throws IOException {
            if (din == null)
                return;
            din.close();
        }

        public int[] nextIntArray(int n) throws IOException {
            int[] arr = new int[n];
            for (int i = 0; i < n; i++) {
                arr[i] = nextInt();
            }
            return arr;
        }

        public long[] nextLongArray(int n) throws IOException {
            long[] arr = new long[n];
            for (int i = 0; i < n; i++) {
                arr[i] = nextLong();
            }
            return arr;
        }

        public int[][] nextInt2DArray(int m, int n) throws IOException {
            int[][] arr = new int[m][n];
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            }
            return arr;
        }

        public long[][] nextInt2DArrayL(int m, int n) throws IOException {
            long[][] arr = new long[m][n];
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < n; j++)
                    arr[i][j] = nextInt();
            }
            return arr;
        }
        // kickstart - Solution
        // atcoder - Main
    }
}