
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;
import java.util.LinkedList;

public class Main {

	
	

	public static void main(String[] args) throws IOException {
		Scanner scn = new Scanner(System.in);
		

		int n=scn.nextInt();
		int cost[]=new int[n];
		for(int i=0;i<n;i++){
			cost[i]=scn.nextInt();
		}
		int dp[]=new int[n];
		Arrays.fill(dp, Integer.MAX_VALUE/2);
		dp[0]=0;
		for(int i=0;i<n;i++){
			for(int j=i-1;j>=i-2 && j>=0;j--){
				dp[i]=Math.min(dp[i], Math.abs(cost[i]-cost[j])+dp[j]);
			}
		}
		
		
		
		
		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