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

class Main{
    public static void main(String[] args) throws Exception{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(br.readLine());
        
        String[] l1 = br.readLine().split(" ");

        int[] arr = new int[N];

        for(int i = 0; i < arr.length; i++){
            arr[i] = Integer.parseInt(l1[i]);
        }

        int[] dp = new int[N];
        Arrays.fill(dp, Integer.MAX_VALUE);
        dp[0] = 0;

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

    }
}
/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