import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);

        Problem solver = new Problem();
        solver.solve(0, in, out);
        out.close();
    }

    static class Problem {
        
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int N = in.nextInt();
            int[] stones = new int[N];
            for(int i = 0; i < N; i++)
                stones[i] = in.nextInt();

            int[] dp = new int[N];
            dp[0] = 0;
            dp[1] = Math.abs(stones[1] - stones[0]);

            for(int i = 2; i < N; i++) {
                int jump1 = Math.abs(stones[i] - stones[i - 1]) + dp[i - 1];
                int jump2 = Math.abs(stones[i] - stones[i - 2]) + dp[i - 2];
                dp[i] = Math.min(jump1, jump2);
            }

            out.println(dp[N - 1]);
        }

    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    }
}
 import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.io.BufferedReader; BufferedReader java.io import java.io.InputStreamReader; InputStreamReader java.io import java.util.StringTokenizer; StringTokenizer java.util public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);

        Problem solver = new Problem();
        solver.solve(0, in, out);
        out.close();
    }

    static class Problem {
        
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int N = in.nextInt();
            int[] stones = new int[N];
            for(int i = 0; i < N; i++)
                stones[i] = in.nextInt();

            int[] dp = new int[N];
            dp[0] = 0;
            dp[1] = Math.abs(stones[1] - stones[0]);

            for(int i = 2; i < N; i++) {
                int jump1 = Math.abs(stones[i] - stones[i - 1]) + dp[i - 1];
                int jump2 = Math.abs(stones[i] - stones[i - 2]) + dp[i - 2];
                dp[i] = Math.min(jump1, jump2);
            }

            out.println(dp[N - 1]);
        }

    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    }
} Main public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);

        Problem solver = new Problem();
        solver.solve(0, in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);

        Problem solver = new Problem();
        solver.solve(0, in, out);
        out.close();
    } InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out InputReader in = new InputReader(inputStream); in new InputReader(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) Problem solver = new Problem(); solver new Problem() solver.solve(0, in, out) solver.solve solver 0 in out out.close() out.close out String[] args args static class Problem {
        
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int N = in.nextInt();
            int[] stones = new int[N];
            for(int i = 0; i < N; i++)
                stones[i] = in.nextInt();

            int[] dp = new int[N];
            dp[0] = 0;
            dp[1] = Math.abs(stones[1] - stones[0]);

            for(int i = 2; i < N; i++) {
                int jump1 = Math.abs(stones[i] - stones[i - 1]) + dp[i - 1];
                int jump2 = Math.abs(stones[i] - stones[i - 2]) + dp[i - 2];
                dp[i] = Math.min(jump1, jump2);
            }

            out.println(dp[N - 1]);
        }

    } Problem public void solve(int testNumber, InputReader in, PrintWriter out) {
            int N = in.nextInt();
            int[] stones = new int[N];
            for(int i = 0; i < N; i++)
                stones[i] = in.nextInt();

            int[] dp = new int[N];
            dp[0] = 0;
            dp[1] = Math.abs(stones[1] - stones[0]);

            for(int i = 2; i < N; i++) {
                int jump1 = Math.abs(stones[i] - stones[i - 1]) + dp[i - 1];
                int jump2 = Math.abs(stones[i] - stones[i - 2]) + dp[i - 2];
                dp[i] = Math.min(jump1, jump2);
            }

            out.println(dp[N - 1]);
        } solve {
            int N = in.nextInt();
            int[] stones = new int[N];
            for(int i = 0; i < N; i++)
                stones[i] = in.nextInt();

            int[] dp = new int[N];
            dp[0] = 0;
            dp[1] = Math.abs(stones[1] - stones[0]);

            for(int i = 2; i < N; i++) {
                int jump1 = Math.abs(stones[i] - stones[i - 1]) + dp[i - 1];
                int jump2 = Math.abs(stones[i] - stones[i - 2]) + dp[i - 2];
                dp[i] = Math.min(jump1, jump2);
            }

            out.println(dp[N - 1]);
        } int N = in.nextInt(); N in.nextInt() in.nextInt in int[] stones = new int[N]; stones new int[N] N for(int i = 0; i < N; i++)
                stones[i] = in.nextInt(); int i = 0; int i = 0; i 0 i < N i N i++ i++ i stones[i] = in.nextInt(); stones[i] = in.nextInt() stones[i] stones i in.nextInt() in.nextInt in int[] dp = new int[N]; dp new int[N] N dp[0] = 0 dp[0] dp 0 0 dp[1] = Math.abs(stones[1] - stones[0]) dp[1] dp 1 Math.abs(stones[1] - stones[0]) Math.abs Math stones[1] - stones[0] stones[1] stones 1 stones[0] stones 0 for(int i = 2; i < N; i++) {
                int jump1 = Math.abs(stones[i] - stones[i - 1]) + dp[i - 1];
                int jump2 = Math.abs(stones[i] - stones[i - 2]) + dp[i - 2];
                dp[i] = Math.min(jump1, jump2);
            } int i = 2; int i = 2; i 2 i < N i N i++ i++ i {
                int jump1 = Math.abs(stones[i] - stones[i - 1]) + dp[i - 1];
                int jump2 = Math.abs(stones[i] - stones[i - 2]) + dp[i - 2];
                dp[i] = Math.min(jump1, jump2);
            } {
                int jump1 = Math.abs(stones[i] - stones[i - 1]) + dp[i - 1];
                int jump2 = Math.abs(stones[i] - stones[i - 2]) + dp[i - 2];
                dp[i] = Math.min(jump1, jump2);
            } int jump1 = Math.abs(stones[i] - stones[i - 1]) + dp[i - 1]; jump1 Math.abs(stones[i] - stones[i - 1]) + dp[i - 1] Math.abs(stones[i] - stones[i - 1]) Math.abs Math stones[i] - stones[i - 1] stones[i] stones i stones[i - 1] stones i - 1 i 1 dp[i - 1] dp i - 1 i 1 int jump2 = Math.abs(stones[i] - stones[i - 2]) + dp[i - 2]; jump2 Math.abs(stones[i] - stones[i - 2]) + dp[i - 2] Math.abs(stones[i] - stones[i - 2]) Math.abs Math stones[i] - stones[i - 2] stones[i] stones i stones[i - 2] stones i - 2 i 2 dp[i - 2] dp i - 2 i 2 dp[i] = Math.min(jump1, jump2) dp[i] dp i Math.min(jump1, jump2) Math.min Math jump1 jump2 out.println(dp[N - 1]) out.println out dp[N - 1] dp N - 1 N 1 int testNumber testNumber InputReader in in PrintWriter out out static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    } InputReader public BufferedReader reader; reader public StringTokenizer tokenizer; tokenizer public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        } InputReader {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        } reader = new BufferedReader(new InputStreamReader(stream), 32768) reader new BufferedReader(new InputStreamReader(stream), 32768) tokenizer = null tokenizer null InputStream stream stream public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        } next {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        } while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            } tokenizer == null || !tokenizer.hasMoreTokens() tokenizer == null tokenizer null !tokenizer.hasMoreTokens() tokenizer.hasMoreTokens() tokenizer.hasMoreTokens tokenizer {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            } try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                } catch (IOException e) {
                    throw new RuntimeException(e);
                } IOException e {
                    throw new RuntimeException(e);
                } throw new RuntimeException(e); new RuntimeException(e) {
                    tokenizer = new StringTokenizer(reader.readLine());
                } tokenizer = new StringTokenizer(reader.readLine()) tokenizer new StringTokenizer(reader.readLine()) return tokenizer.nextToken(); tokenizer.nextToken() tokenizer.nextToken tokenizer public int nextInt() {
            return Integer.parseInt(next());
        } nextInt {
            return Integer.parseInt(next());
        } return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);

        Problem solver = new Problem();
        solver.solve(0, in, out);
        out.close();
    }

    static class Problem {
        
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int N = in.nextInt();
            int[] stones = new int[N];
            for(int i = 0; i < N; i++)
                stones[i] = in.nextInt();

            int[] dp = new int[N];
            dp[0] = 0;
            dp[1] = Math.abs(stones[1] - stones[0]);

            for(int i = 2; i < N; i++) {
                int jump1 = Math.abs(stones[i] - stones[i - 1]) + dp[i - 1];
                int jump2 = Math.abs(stones[i] - stones[i - 2]) + dp[i - 2];
                dp[i] = Math.min(jump1, jump2);
            }

            out.println(dp[N - 1]);
        }

    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    }
} public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);

        Problem solver = new Problem();
        solver.solve(0, in, out);
        out.close();
    }

    static class Problem {
        
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int N = in.nextInt();
            int[] stones = new int[N];
            for(int i = 0; i < N; i++)
                stones[i] = in.nextInt();

            int[] dp = new int[N];
            dp[0] = 0;
            dp[1] = Math.abs(stones[1] - stones[0]);

            for(int i = 2; i < N; i++) {
                int jump1 = Math.abs(stones[i] - stones[i - 1]) + dp[i - 1];
                int jump2 = Math.abs(stones[i] - stones[i - 2]) + dp[i - 2];
                dp[i] = Math.min(jump1, jump2);
            }

            out.println(dp[N - 1]);
        }

    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    }
} Main
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);

        Problem solver = new Problem();
        solver.solve(0, in, out);
        out.close();
    }

    static class Problem {
        
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int N = in.nextInt();
            int[] stones = new int[N];
            for(int i = 0; i < N; i++)
                stones[i] = in.nextInt();

            int[] dp = new int[N];
            dp[0] = 0;
            dp[1] = Math.abs(stones[1] - stones[0]);

            for(int i = 2; i < N; i++) {
                int jump1 = Math.abs(stones[i] - stones[i - 1]) + dp[i - 1];
                int jump2 = Math.abs(stones[i] - stones[i - 2]) + dp[i - 2];
                dp[i] = Math.min(jump1, jump2);
            }

            out.println(dp[N - 1]);
        }

    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    }
}

