import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] arr = new int[n];
        for (int i = 0; i < n; i++) {
            arr[i] = sc.nextInt();
        }

        System.out.println(execute(arr, n));
        sc.close();
    }

    private static int execute(int[] arr, int length) {
        int[] dp = new int[length];
        dp[0] = 0;
        dp[1] = Math.abs(arr[1] - arr[0]);
        for (int i = 2; i < length; i++) {

            dp[i] = Math.min(dp[i - 2] + Math.abs(arr[i] - arr[i - 2]), dp[i - 1] + Math.abs(arr[i] - arr[i - 1]));

        }
        return dp[length - 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