import java.util.*;
import java.io.*;

class Main {
    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[64]; // 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();
        }
    }

    static final Reader in = new Reader();
    static int N;
    static int[] h;

    static long[] dp;

    public static void main(String[] args) throws Exception {
        N = in.nextInt();
        h = new int[N];
        dp = new long[N];
        for (int i = 0; i < N; i++)
            h[i] = in.nextInt();

        // System.out.println(getAns(N - 1));
        dp[1] = Math.abs(h[1] - h[0]);
        for(int i = 2;i < N;i++)
        {
            dp[i] = Math.min(dp[i-1] + Math.abs(h[i] - h[i-1]),dp[i-2] + Math.abs(h[i] - h[i-2]));
        }
        System.out.println(dp[N-1]);
    }

    static long getAns(int n) {
        // System.out.println("n = "+n);
        if (n == 0)
            return 0;
        if (n == 1)
            return Math.abs(h[1] - h[0]);

        long ans1;
        if (dp[n - 1] == 0)
            dp[n - 1] = getAns(n - 1);
        ans1 = dp[n - 1];
        ans1 += Math.abs(h[n] - h[n - 1]);

        long ans2;
        if (dp[n - 2] == 0)
            dp[n - 2] = getAns(n - 2);
        ans2 = dp[n - 2];
        ans2 += Math.abs(h[n] - h[n - 2]);
        // System.out.println("n = "+n+" ans1 = "+ans1+" ans2 = "+ans2);

        return Math.min(ans1, ans2);
    }
} import java.util.*; util.* java import java.io.*; io.* java class Main {
    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[64]; // 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();
        }
    }

    static final Reader in = new Reader();
    static int N;
    static int[] h;

    static long[] dp;

    public static void main(String[] args) throws Exception {
        N = in.nextInt();
        h = new int[N];
        dp = new long[N];
        for (int i = 0; i < N; i++)
            h[i] = in.nextInt();

        // System.out.println(getAns(N - 1));
        dp[1] = Math.abs(h[1] - h[0]);
        for(int i = 2;i < N;i++)
        {
            dp[i] = Math.min(dp[i-1] + Math.abs(h[i] - h[i-1]),dp[i-2] + Math.abs(h[i] - h[i-2]));
        }
        System.out.println(dp[N-1]);
    }

    static long getAns(int n) {
        // System.out.println("n = "+n);
        if (n == 0)
            return 0;
        if (n == 1)
            return Math.abs(h[1] - h[0]);

        long ans1;
        if (dp[n - 1] == 0)
            dp[n - 1] = getAns(n - 1);
        ans1 = dp[n - 1];
        ans1 += Math.abs(h[n] - h[n - 1]);

        long ans2;
        if (dp[n - 2] == 0)
            dp[n - 2] = getAns(n - 2);
        ans2 = dp[n - 2];
        ans2 += Math.abs(h[n] - h[n - 2]);
        // System.out.println("n = "+n+" ans1 = "+ans1+" ans2 = "+ans2);

        return Math.min(ans1, ans2);
    }
} Main static final Reader in = new Reader(); in new Reader() static int N; N static int[] h; h static long[] dp; dp public static void main(String[] args) throws Exception {
        N = in.nextInt();
        h = new int[N];
        dp = new long[N];
        for (int i = 0; i < N; i++)
            h[i] = in.nextInt();

        // System.out.println(getAns(N - 1));
        dp[1] = Math.abs(h[1] - h[0]);
        for(int i = 2;i < N;i++)
        {
            dp[i] = Math.min(dp[i-1] + Math.abs(h[i] - h[i-1]),dp[i-2] + Math.abs(h[i] - h[i-2]));
        }
        System.out.println(dp[N-1]);
    } main {
        N = in.nextInt();
        h = new int[N];
        dp = new long[N];
        for (int i = 0; i < N; i++)
            h[i] = in.nextInt();

        // System.out.println(getAns(N - 1));
        dp[1] = Math.abs(h[1] - h[0]);
        for(int i = 2;i < N;i++)
        {
            dp[i] = Math.min(dp[i-1] + Math.abs(h[i] - h[i-1]),dp[i-2] + Math.abs(h[i] - h[i-2]));
        }
        System.out.println(dp[N-1]);
    } N = in.nextInt() N in.nextInt() in.nextInt in h = new int[N] h new int[N] N dp = new long[N] dp new long[N] N for (int i = 0; i < N; i++)
            h[i] = in.nextInt(); int i = 0; int i = 0; i 0 i < N i N i++ i++ i h[i] = in.nextInt(); h[i] = in.nextInt() h[i] h i in.nextInt() in.nextInt in dp[1] = Math.abs(h[1] - h[0]) dp[1] dp 1 Math.abs(h[1] - h[0]) Math.abs Math h[1] - h[0] h[1] h 1 h[0] h 0 for(int i = 2;i < N;i++)
        {
            dp[i] = Math.min(dp[i-1] + Math.abs(h[i] - h[i-1]),dp[i-2] + Math.abs(h[i] - h[i-2]));
        } int i = 2; int i = 2; i 2 i < N i N i++ i++ i {
            dp[i] = Math.min(dp[i-1] + Math.abs(h[i] - h[i-1]),dp[i-2] + Math.abs(h[i] - h[i-2]));
        } {
            dp[i] = Math.min(dp[i-1] + Math.abs(h[i] - h[i-1]),dp[i-2] + Math.abs(h[i] - h[i-2]));
        } dp[i] = Math.min(dp[i-1] + Math.abs(h[i] - h[i-1]),dp[i-2] + Math.abs(h[i] - h[i-2])) dp[i] dp i Math.min(dp[i-1] + Math.abs(h[i] - h[i-1]),dp[i-2] + Math.abs(h[i] - h[i-2])) Math.min Math dp[i-1] + Math.abs(h[i] - h[i-1]) dp[i-1] dp 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 dp[i-2] + Math.abs(h[i] - h[i-2]) dp[i-2] dp 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 System.out.println(dp[N-1]) System.out.println System.out System System.out dp[N-1] dp N-1 N 1 String[] args args static long getAns(int n) {
        // System.out.println("n = "+n);
        if (n == 0)
            return 0;
        if (n == 1)
            return Math.abs(h[1] - h[0]);

        long ans1;
        if (dp[n - 1] == 0)
            dp[n - 1] = getAns(n - 1);
        ans1 = dp[n - 1];
        ans1 += Math.abs(h[n] - h[n - 1]);

        long ans2;
        if (dp[n - 2] == 0)
            dp[n - 2] = getAns(n - 2);
        ans2 = dp[n - 2];
        ans2 += Math.abs(h[n] - h[n - 2]);
        // System.out.println("n = "+n+" ans1 = "+ans1+" ans2 = "+ans2);

        return Math.min(ans1, ans2);
    } getAns {
        // System.out.println("n = "+n);
        if (n == 0)
            return 0;
        if (n == 1)
            return Math.abs(h[1] - h[0]);

        long ans1;
        if (dp[n - 1] == 0)
            dp[n - 1] = getAns(n - 1);
        ans1 = dp[n - 1];
        ans1 += Math.abs(h[n] - h[n - 1]);

        long ans2;
        if (dp[n - 2] == 0)
            dp[n - 2] = getAns(n - 2);
        ans2 = dp[n - 2];
        ans2 += Math.abs(h[n] - h[n - 2]);
        // System.out.println("n = "+n+" ans1 = "+ans1+" ans2 = "+ans2);

        return Math.min(ans1, ans2);
    } if (n == 0)
            return 0; n == 0 n 0 return 0; 0 if (n == 1)
            return Math.abs(h[1] - h[0]); n == 1 n 1 return Math.abs(h[1] - h[0]); Math.abs(h[1] - h[0]) Math.abs Math h[1] - h[0] h[1] h 1 h[0] h 0 long ans1; ans1 if (dp[n - 1] == 0)
            dp[n - 1] = getAns(n - 1); dp[n - 1] == 0 dp[n - 1] dp n - 1 n 1 0 dp[n - 1] = getAns(n - 1) dp[n - 1] dp n - 1 n 1 getAns(n - 1) getAns n - 1 n 1 ans1 = dp[n - 1] ans1 dp[n - 1] dp n - 1 n 1 ans1 += Math.abs(h[n] - h[n - 1]) ans1 Math.abs(h[n] - h[n - 1]) Math.abs Math h[n] - h[n - 1] h[n] h n h[n - 1] h n - 1 n 1 long ans2; ans2 if (dp[n - 2] == 0)
            dp[n - 2] = getAns(n - 2); dp[n - 2] == 0 dp[n - 2] dp n - 2 n 2 0 dp[n - 2] = getAns(n - 2) dp[n - 2] dp n - 2 n 2 getAns(n - 2) getAns n - 2 n 2 ans2 = dp[n - 2] ans2 dp[n - 2] dp n - 2 n 2 ans2 += Math.abs(h[n] - h[n - 2]) ans2 Math.abs(h[n] - h[n - 2]) Math.abs Math h[n] - h[n - 2] h[n] h n h[n - 2] h n - 2 n 2 return Math.min(ans1, ans2); Math.min(ans1, ans2) Math.min Math ans1 ans2 int n n 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[64]; // 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();
        }
    } 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[64]; // 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[64]; // 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[64]; buf new byte[64] 64 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
import java.util.*;
import java.io.*;

class Main {
    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[64]; // 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();
        }
    }

    static final Reader in = new Reader();
    static int N;
    static int[] h;

    static long[] dp;

    public static void main(String[] args) throws Exception {
        N = in.nextInt();
        h = new int[N];
        dp = new long[N];
        for (int i = 0; i < N; i++)
            h[i] = in.nextInt();

        // System.out.println(getAns(N - 1));
        dp[1] = Math.abs(h[1] - h[0]);
        for(int i = 2;i < N;i++)
        {
            dp[i] = Math.min(dp[i-1] + Math.abs(h[i] - h[i-1]),dp[i-2] + Math.abs(h[i] - h[i-2]));
        }
        System.out.println(dp[N-1]);
    }

    static long getAns(int n) {
        // System.out.println("n = "+n);
        if (n == 0)
            return 0;
        if (n == 1)
            return Math.abs(h[1] - h[0]);

        long ans1;
        if (dp[n - 1] == 0)
            dp[n - 1] = getAns(n - 1);
        ans1 = dp[n - 1];
        ans1 += Math.abs(h[n] - h[n - 1]);

        long ans2;
        if (dp[n - 2] == 0)
            dp[n - 2] = getAns(n - 2);
        ans2 = dp[n - 2];
        ans2 += Math.abs(h[n] - h[n - 2]);
        // System.out.println("n = "+n+" ans1 = "+ans1+" ans2 = "+ans2);

        return Math.min(ans1, ans2);
    }
}