/* package codechef; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner s=new Scanner(System.in);
		int n=s.nextInt();
		int a[]=new int[n];
		for(int i=0;i<n;i++)
		{
		    a[i]=s.nextInt();
		}
		
		int dp[]=new int[n];
		dp[0]=0;
		dp[1]=Math.abs(a[0]-a[1]);
		for(int i=2;i<n;i++)
		{
		    dp[i]=Math.min(Math.abs(a[i]-a[i-1])+dp[i-1],Math.abs(a[i]-a[i-2])+dp[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