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 x = 0;
        int y = Math.abs(arr[1] - arr[0]);
        for (int i = 2; i < length; i++) {
            int temp = y;
            y = Math.min(x + Math.abs(arr[i] - arr[i - 2]), y + Math.abs(arr[i] - arr[i - 1]));
            x = temp;
        }
        return y;
    }
}
/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