import java.util.Arrays;
import java.util.HashMap;
import java.util.Scanner;

public class Main{
	
	public static void main(String[] args) {
		
		Scanner s=new Scanner(System.in);

		int n=s.nextInt();
		int[] arr=new int[n];
		for(int i=0;i<n;i++) {
			arr[i]=s.nextInt();
		}
		
		int[] dp=new int[n];
		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