import java.util.Scanner;

class Main {

	static Scanner sc = new Scanner(System.in);

	public static void main(String[] args) {
		int N = sc.nextInt(),i, h[] = new int[N];
		for(i=0;i<N;i++)h[i]=sc.nextInt();
		int dp[]=new int[N+1];
		dp[0]=0;
		dp[1]=Math.abs(h[1]-h[0]);
		for(i=2;i<N;i++) {
			dp[i]=Math.min(dp[i-1]+Math.abs(h[i]-h[i-1]), dp[i-2]+Math.abs(h[i]-h[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