import javax.imageio.metadata.IIOMetadataFormatImpl;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(reader.readLine());
        String[] po = reader.readLine().split(" ");
        int[] arr = new int[N];
        int[] dp = new int[N];
        for (int i = 0; i < N; i++) {
            arr[i] = Integer.parseInt(po[i]);
        }
        dp[0] = 0;
        dp[1] = Math.abs(arr[1]-arr[0]);
        for (int i = 2; i <N ; i++) {
            dp[i] = Math.min(dp[i-1]+Math.abs(arr[i]-arr[i-1]),dp[i-2]+Math.abs(arr[i]-arr[i-2]));
        }
        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