import java.util.*;
import java.lang.*;
import java.io.*;
//import java.util.stream.Collectors;
public 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();
        }
    }

     public static Reader sc = new Reader();
//    public static Scanner sc = new Scanner(System.in);
    public static BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));
//    public static OutputStream out2 = new BufferedOutputStream (System.out);
    public static int n, m, i, j, k, mod = (int)1e9+7;
    public static int[] arr = new int[100005];
    public static int[] dp = new int[100005];
    public static void main(String[] args) throws IOException
    {
        n = sc.nextInt();
        for (i = 0; i < n; i++)
        {
            arr[i] = sc.nextInt();
            dp[i] = Integer.MAX_VALUE;
            dp[i+1] = Integer.MAX_VALUE;
        }
        dp[n-1] = 0;
        for(i = n-2; i >= 0; i--)
        {
            dp[i] = Math.min(dp[i], dp[i + 1] + Math.abs(arr[i + 1] - arr[i]));
//            System.out.println(dp[i+1]);
            if(i != n-2)
                dp[i] = Math.min(dp[i], dp[i + 2] + Math.abs(arr[i + 2] - arr[i]));
        }
        out.write(dp[0]+"");
        out.flush();
    }
//    public static int recur(int index)
//    {
//        if(index >= n-1)
//            return 0;
//        if(dp[index] != 0)
//            return dp[index];
//        int cost = Integer.MAX_VALUE;
//        cost = Math.min(cost, recur(index+1) + Math.abs(arr[index+1]-arr[index]));
//        if(index + 2 < n)
//            cost = Math.min(cost, recur(index+2) + Math.abs(arr[index+2]-arr[index]));
//        return dp[index] = cost;
//    }
}
 import java.util.*; util.* java import java.lang.*; lang.* java import java.io.*; io.* java public 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();
        }
    }

     public static Reader sc = new Reader();
//    public static Scanner sc = new Scanner(System.in);
    public static BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));
//    public static OutputStream out2 = new BufferedOutputStream (System.out);
    public static int n, m, i, j, k, mod = (int)1e9+7;
    public static int[] arr = new int[100005];
    public static int[] dp = new int[100005];
    public static void main(String[] args) throws IOException
    {
        n = sc.nextInt();
        for (i = 0; i < n; i++)
        {
            arr[i] = sc.nextInt();
            dp[i] = Integer.MAX_VALUE;
            dp[i+1] = Integer.MAX_VALUE;
        }
        dp[n-1] = 0;
        for(i = n-2; i >= 0; i--)
        {
            dp[i] = Math.min(dp[i], dp[i + 1] + Math.abs(arr[i + 1] - arr[i]));
//            System.out.println(dp[i+1]);
            if(i != n-2)
                dp[i] = Math.min(dp[i], dp[i + 2] + Math.abs(arr[i + 2] - arr[i]));
        }
        out.write(dp[0]+"");
        out.flush();
    }
//    public static int recur(int index)
//    {
//        if(index >= n-1)
//            return 0;
//        if(dp[index] != 0)
//            return dp[index];
//        int cost = Integer.MAX_VALUE;
//        cost = Math.min(cost, recur(index+1) + Math.abs(arr[index+1]-arr[index]));
//        if(index + 2 < n)
//            cost = Math.min(cost, recur(index+2) + Math.abs(arr[index+2]-arr[index]));
//        return dp[index] = cost;
//    }
} Main public static Reader sc = new Reader(); sc new Reader() //    public static Scanner sc = new Scanner(System.in);
    public static BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out)); out new BufferedWriter(new OutputStreamWriter(System.out)) //    public static OutputStream out2 = new BufferedOutputStream (System.out);
    public static int n n m m i i j j k k mod = (int)1e9+7; mod (int)1e9+7 (int)1e9 7 public static int[] arr = new int[100005]; arr new int[100005] 100005 public static int[] dp = new int[100005]; dp new int[100005] 100005 public static void main(String[] args) throws IOException
    {
        n = sc.nextInt();
        for (i = 0; i < n; i++)
        {
            arr[i] = sc.nextInt();
            dp[i] = Integer.MAX_VALUE;
            dp[i+1] = Integer.MAX_VALUE;
        }
        dp[n-1] = 0;
        for(i = n-2; i >= 0; i--)
        {
            dp[i] = Math.min(dp[i], dp[i + 1] + Math.abs(arr[i + 1] - arr[i]));
//            System.out.println(dp[i+1]);
            if(i != n-2)
                dp[i] = Math.min(dp[i], dp[i + 2] + Math.abs(arr[i + 2] - arr[i]));
        }
        out.write(dp[0]+"");
        out.flush();
    } main {
        n = sc.nextInt();
        for (i = 0; i < n; i++)
        {
            arr[i] = sc.nextInt();
            dp[i] = Integer.MAX_VALUE;
            dp[i+1] = Integer.MAX_VALUE;
        }
        dp[n-1] = 0;
        for(i = n-2; i >= 0; i--)
        {
            dp[i] = Math.min(dp[i], dp[i + 1] + Math.abs(arr[i + 1] - arr[i]));
//            System.out.println(dp[i+1]);
            if(i != n-2)
                dp[i] = Math.min(dp[i], dp[i + 2] + Math.abs(arr[i + 2] - arr[i]));
        }
        out.write(dp[0]+"");
        out.flush();
    } n = sc.nextInt() n sc.nextInt() sc.nextInt sc for (i = 0; i < n; i++)
        {
            arr[i] = sc.nextInt();
            dp[i] = Integer.MAX_VALUE;
            dp[i+1] = Integer.MAX_VALUE;
        } i = 0; i = 0 i 0 i < n i n i++ i++ i {
            arr[i] = sc.nextInt();
            dp[i] = Integer.MAX_VALUE;
            dp[i+1] = Integer.MAX_VALUE;
        } {
            arr[i] = sc.nextInt();
            dp[i] = Integer.MAX_VALUE;
            dp[i+1] = Integer.MAX_VALUE;
        } arr[i] = sc.nextInt() arr[i] arr i sc.nextInt() sc.nextInt sc dp[i] = Integer.MAX_VALUE dp[i] dp i Integer.MAX_VALUE Integer Integer.MAX_VALUE dp[i+1] = Integer.MAX_VALUE dp[i+1] dp i+1 i 1 Integer.MAX_VALUE Integer Integer.MAX_VALUE dp[n-1] = 0 dp[n-1] dp n-1 n 1 0 for(i = n-2; i >= 0; i--)
        {
            dp[i] = Math.min(dp[i], dp[i + 1] + Math.abs(arr[i + 1] - arr[i]));
//            System.out.println(dp[i+1]);
            if(i != n-2)
                dp[i] = Math.min(dp[i], dp[i + 2] + Math.abs(arr[i + 2] - arr[i]));
        } i = n-2; i = n-2 i n-2 n 2 i >= 0 i 0 i-- i-- i {
            dp[i] = Math.min(dp[i], dp[i + 1] + Math.abs(arr[i + 1] - arr[i]));
//            System.out.println(dp[i+1]);
            if(i != n-2)
                dp[i] = Math.min(dp[i], dp[i + 2] + Math.abs(arr[i + 2] - arr[i]));
        } {
            dp[i] = Math.min(dp[i], dp[i + 1] + Math.abs(arr[i + 1] - arr[i]));
//            System.out.println(dp[i+1]);
            if(i != n-2)
                dp[i] = Math.min(dp[i], dp[i + 2] + Math.abs(arr[i + 2] - arr[i]));
        } dp[i] = Math.min(dp[i], dp[i + 1] + Math.abs(arr[i + 1] - arr[i])) dp[i] dp i Math.min(dp[i], dp[i + 1] + Math.abs(arr[i + 1] - arr[i])) Math.min Math dp[i] dp i dp[i + 1] + Math.abs(arr[i + 1] - arr[i]) dp[i + 1] dp i + 1 i 1 Math.abs(arr[i + 1] - arr[i]) Math.abs Math arr[i + 1] - arr[i] arr[i + 1] arr i + 1 i 1 arr[i] arr i if(i != n-2)
                dp[i] = Math.min(dp[i], dp[i + 2] + Math.abs(arr[i + 2] - arr[i])); i != n-2 i n-2 n 2 dp[i] = Math.min(dp[i], dp[i + 2] + Math.abs(arr[i + 2] - arr[i])) dp[i] dp i Math.min(dp[i], dp[i + 2] + Math.abs(arr[i + 2] - arr[i])) Math.min Math dp[i] dp i dp[i + 2] + Math.abs(arr[i + 2] - arr[i]) dp[i + 2] dp i + 2 i 2 Math.abs(arr[i + 2] - arr[i]) Math.abs Math arr[i + 2] - arr[i] arr[i + 2] arr i + 2 i 2 arr[i] arr i out.write(dp[0]+"") out.write out dp[0]+"" dp[0] dp 0 "" out.flush() out.flush out String[] args args 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 public 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();
        }
    }

     public static Reader sc = new Reader();
//    public static Scanner sc = new Scanner(System.in);
    public static BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));
//    public static OutputStream out2 = new BufferedOutputStream (System.out);
    public static int n, m, i, j, k, mod = (int)1e9+7;
    public static int[] arr = new int[100005];
    public static int[] dp = new int[100005];
    public static void main(String[] args) throws IOException
    {
        n = sc.nextInt();
        for (i = 0; i < n; i++)
        {
            arr[i] = sc.nextInt();
            dp[i] = Integer.MAX_VALUE;
            dp[i+1] = Integer.MAX_VALUE;
        }
        dp[n-1] = 0;
        for(i = n-2; i >= 0; i--)
        {
            dp[i] = Math.min(dp[i], dp[i + 1] + Math.abs(arr[i + 1] - arr[i]));
//            System.out.println(dp[i+1]);
            if(i != n-2)
                dp[i] = Math.min(dp[i], dp[i + 2] + Math.abs(arr[i + 2] - arr[i]));
        }
        out.write(dp[0]+"");
        out.flush();
    }
//    public static int recur(int index)
//    {
//        if(index >= n-1)
//            return 0;
//        if(dp[index] != 0)
//            return dp[index];
//        int cost = Integer.MAX_VALUE;
//        cost = Math.min(cost, recur(index+1) + Math.abs(arr[index+1]-arr[index]));
//        if(index + 2 < n)
//            cost = Math.min(cost, recur(index+2) + Math.abs(arr[index+2]-arr[index]));
//        return dp[index] = cost;
//    }
} public 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();
        }
    }

     public static Reader sc = new Reader();
//    public static Scanner sc = new Scanner(System.in);
    public static BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));
//    public static OutputStream out2 = new BufferedOutputStream (System.out);
    public static int n, m, i, j, k, mod = (int)1e9+7;
    public static int[] arr = new int[100005];
    public static int[] dp = new int[100005];
    public static void main(String[] args) throws IOException
    {
        n = sc.nextInt();
        for (i = 0; i < n; i++)
        {
            arr[i] = sc.nextInt();
            dp[i] = Integer.MAX_VALUE;
            dp[i+1] = Integer.MAX_VALUE;
        }
        dp[n-1] = 0;
        for(i = n-2; i >= 0; i--)
        {
            dp[i] = Math.min(dp[i], dp[i + 1] + Math.abs(arr[i + 1] - arr[i]));
//            System.out.println(dp[i+1]);
            if(i != n-2)
                dp[i] = Math.min(dp[i], dp[i + 2] + Math.abs(arr[i + 2] - arr[i]));
        }
        out.write(dp[0]+"");
        out.flush();
    }
//    public static int recur(int index)
//    {
//        if(index >= n-1)
//            return 0;
//        if(dp[index] != 0)
//            return dp[index];
//        int cost = Integer.MAX_VALUE;
//        cost = Math.min(cost, recur(index+1) + Math.abs(arr[index+1]-arr[index]));
//        if(index + 2 < n)
//            cost = Math.min(cost, recur(index+2) + Math.abs(arr[index+2]-arr[index]));
//        return dp[index] = cost;
//    }
} Main
import java.util.*;
import java.lang.*;
import java.io.*;
//import java.util.stream.Collectors;
public 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();
        }
    }

     public static Reader sc = new Reader();
//    public static Scanner sc = new Scanner(System.in);
    public static BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));
//    public static OutputStream out2 = new BufferedOutputStream (System.out);
    public static int n, m, i, j, k, mod = (int)1e9+7;
    public static int[] arr = new int[100005];
    public static int[] dp = new int[100005];
    public static void main(String[] args) throws IOException
    {
        n = sc.nextInt();
        for (i = 0; i < n; i++)
        {
            arr[i] = sc.nextInt();
            dp[i] = Integer.MAX_VALUE;
            dp[i+1] = Integer.MAX_VALUE;
        }
        dp[n-1] = 0;
        for(i = n-2; i >= 0; i--)
        {
            dp[i] = Math.min(dp[i], dp[i + 1] + Math.abs(arr[i + 1] - arr[i]));
//            System.out.println(dp[i+1]);
            if(i != n-2)
                dp[i] = Math.min(dp[i], dp[i + 2] + Math.abs(arr[i + 2] - arr[i]));
        }
        out.write(dp[0]+"");
        out.flush();
    }
//    public static int recur(int index)
//    {
//        if(index >= n-1)
//            return 0;
//        if(dp[index] != 0)
//            return dp[index];
//        int cost = Integer.MAX_VALUE;
//        cost = Math.min(cost, recur(index+1) + Math.abs(arr[index+1]-arr[index]));
//        if(index + 2 < n)
//            cost = Math.min(cost, recur(index+2) + Math.abs(arr[index+2]-arr[index]));
//        return dp[index] = cost;
//    }
}

