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

class Main {

    // Generated by 1.1.7.1 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
    public static void main(String[] args) throws Exception {
        final Scanner sc = new Scanner(System.in);
        long N;
        N = sc.nextLong();
        long[] h = new long[(int)(N)];
        for(int i = 0 ; i < N ; i++){
                h[i] = sc.nextLong();
        }
        solve(N, h);
    }

    static void solve(long N, long[] h){
        if (N == 2) {
            System.out.print(h[1] - h[0]);
            return;
        }

        long[] dp = new long[(int)(N+1)];
        dp[2] = Math.abs(h[1] - h[0]);
        
        for (int i = 3; i <= N; i++){
            dp[i] = Math.min(
                dp[i-1] + Math.abs(h[i-1] - h[i-2]),
                dp[i-2] + Math.abs(h[i-1] - h[i-3])
            );
        }
        System.out.print(dp[(int)(N)]);
        return;
    }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz