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

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author Coer
 */
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);
        TaskA solver = new TaskA();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskA {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int n = in.nextInt();
            int[] h = new int[n + 1];
            for (int i = 1; i < n + 1; i++) {
                h[i] = in.nextInt();
            }
            int[] dp = new int[n + 1];
            dp[1] = 0;
            dp[2] = Math.abs(h[1] - h[2]);
            for (int i = 3; i < n + 1; i++) {
                dp[i] = Math.min(dp[i - 2] + Math.abs(h[i] - h[i - 2]), dp[i - 1] + Math.abs(h[i] - h[i - 1]));
            }
            out.println(dp[n]);
        }

    }

    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.util.StringTokenizer; StringTokenizer java.util import java.io.IOException; IOException java.io import java.io.BufferedReader; BufferedReader java.io import java.io.InputStreamReader; InputStreamReader java.io import java.io.InputStream; InputStream java.io 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);
        TaskA solver = new TaskA();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskA {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int n = in.nextInt();
            int[] h = new int[n + 1];
            for (int i = 1; i < n + 1; i++) {
                h[i] = in.nextInt();
            }
            int[] dp = new int[n + 1];
            dp[1] = 0;
            dp[2] = Math.abs(h[1] - h[2]);
            for (int i = 3; i < n + 1; i++) {
                dp[i] = Math.min(dp[i - 2] + Math.abs(h[i] - h[i - 2]), dp[i - 1] + Math.abs(h[i] - h[i - 1]));
            }
            out.println(dp[n]);
        }

    }

    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);
        TaskA solver = new TaskA();
        solver.solve(1, in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskA solver = new TaskA();
        solver.solve(1, 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) TaskA solver = new TaskA(); solver new TaskA() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class TaskA {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int n = in.nextInt();
            int[] h = new int[n + 1];
            for (int i = 1; i < n + 1; i++) {
                h[i] = in.nextInt();
            }
            int[] dp = new int[n + 1];
            dp[1] = 0;
            dp[2] = Math.abs(h[1] - h[2]);
            for (int i = 3; i < n + 1; i++) {
                dp[i] = Math.min(dp[i - 2] + Math.abs(h[i] - h[i - 2]), dp[i - 1] + Math.abs(h[i] - h[i - 1]));
            }
            out.println(dp[n]);
        }

    } TaskA public void solve(int testNumber, InputReader in, PrintWriter out) {
            int n = in.nextInt();
            int[] h = new int[n + 1];
            for (int i = 1; i < n + 1; i++) {
                h[i] = in.nextInt();
            }
            int[] dp = new int[n + 1];
            dp[1] = 0;
            dp[2] = Math.abs(h[1] - h[2]);
            for (int i = 3; i < n + 1; i++) {
                dp[i] = Math.min(dp[i - 2] + Math.abs(h[i] - h[i - 2]), dp[i - 1] + Math.abs(h[i] - h[i - 1]));
            }
            out.println(dp[n]);
        } solve {
            int n = in.nextInt();
            int[] h = new int[n + 1];
            for (int i = 1; i < n + 1; i++) {
                h[i] = in.nextInt();
            }
            int[] dp = new int[n + 1];
            dp[1] = 0;
            dp[2] = Math.abs(h[1] - h[2]);
            for (int i = 3; i < n + 1; i++) {
                dp[i] = Math.min(dp[i - 2] + Math.abs(h[i] - h[i - 2]), dp[i - 1] + Math.abs(h[i] - h[i - 1]));
            }
            out.println(dp[n]);
        } int n = in.nextInt(); n in.nextInt() in.nextInt in int[] h = new int[n + 1]; h new int[n + 1] n + 1 n 1 for (int i = 1; i < n + 1; i++) {
                h[i] = in.nextInt();
            } int i = 1; int i = 1; i 1 i < n + 1 i n + 1 n 1 i++ i++ i {
                h[i] = in.nextInt();
            } {
                h[i] = in.nextInt();
            } h[i] = in.nextInt() h[i] h i in.nextInt() in.nextInt in int[] dp = new int[n + 1]; dp new int[n + 1] n + 1 n 1 dp[1] = 0 dp[1] dp 1 0 dp[2] = Math.abs(h[1] - h[2]) dp[2] dp 2 Math.abs(h[1] - h[2]) Math.abs Math h[1] - h[2] h[1] h 1 h[2] h 2 for (int i = 3; i < n + 1; i++) {
                dp[i] = Math.min(dp[i - 2] + Math.abs(h[i] - h[i - 2]), dp[i - 1] + Math.abs(h[i] - h[i - 1]));
            } int i = 3; int i = 3; i 3 i < n + 1 i n + 1 n 1 i++ i++ i {
                dp[i] = Math.min(dp[i - 2] + Math.abs(h[i] - h[i - 2]), dp[i - 1] + Math.abs(h[i] - h[i - 1]));
            } {
                dp[i] = Math.min(dp[i - 2] + Math.abs(h[i] - h[i - 2]), dp[i - 1] + Math.abs(h[i] - h[i - 1]));
            } dp[i] = Math.min(dp[i - 2] + Math.abs(h[i] - h[i - 2]), dp[i - 1] + Math.abs(h[i] - h[i - 1])) dp[i] dp i Math.min(dp[i - 2] + Math.abs(h[i] - h[i - 2]), dp[i - 1] + Math.abs(h[i] - h[i - 1])) Math.min Math 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 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 out.println(dp[n]) out.println out dp[n] dp n 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);
        TaskA solver = new TaskA();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskA {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int n = in.nextInt();
            int[] h = new int[n + 1];
            for (int i = 1; i < n + 1; i++) {
                h[i] = in.nextInt();
            }
            int[] dp = new int[n + 1];
            dp[1] = 0;
            dp[2] = Math.abs(h[1] - h[2]);
            for (int i = 3; i < n + 1; i++) {
                dp[i] = Math.min(dp[i - 2] + Math.abs(h[i] - h[i - 2]), dp[i - 1] + Math.abs(h[i] - h[i - 1]));
            }
            out.println(dp[n]);
        }

    }

    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);
        TaskA solver = new TaskA();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskA {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int n = in.nextInt();
            int[] h = new int[n + 1];
            for (int i = 1; i < n + 1; i++) {
                h[i] = in.nextInt();
            }
            int[] dp = new int[n + 1];
            dp[1] = 0;
            dp[2] = Math.abs(h[1] - h[2]);
            for (int i = 3; i < n + 1; i++) {
                dp[i] = Math.min(dp[i - 2] + Math.abs(h[i] - h[i - 2]), dp[i - 1] + Math.abs(h[i] - h[i - 1]));
            }
            out.println(dp[n]);
        }

    }

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

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author Coer
 */
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);
        TaskA solver = new TaskA();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskA {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int n = in.nextInt();
            int[] h = new int[n + 1];
            for (int i = 1; i < n + 1; i++) {
                h[i] = in.nextInt();
            }
            int[] dp = new int[n + 1];
            dp[1] = 0;
            dp[2] = Math.abs(h[1] - h[2]);
            for (int i = 3; i < n + 1; i++) {
                dp[i] = Math.min(dp[i - 2] + Math.abs(h[i] - h[i - 2]), dp[i - 1] + Math.abs(h[i] - h[i - 1]));
            }
            out.println(dp[n]);
        }

    }

    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());
        }

    }
}