import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
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+1];
	    dp[0]=0;
	    dp[1]=0;
	    dp[2]=Math.abs(arr[1]-arr[0]);
	    for(int i=2;i<n;i++){
	        int op1=Math.abs(arr[i]-arr[i-2]);
	        int op2=Math.abs(arr[i]-arr[i-1]);
	        dp[i+1]=Math.min(dp[i]+op2,dp[i-1]+op1);
	    }
	    System.out.println(dp[n]);
	    
	}
}
/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