
 
import java.io.*;
public class Main{
 
   
  public static void main(String[] args) throws IOException
  {
     
    BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
    int n=Integer.parseInt(br.readLine());
    String line=br.readLine();
    String str[]=line.trim().split("\\s+");
    int arr[]=new int[n];
    
    for(int i=0;i<n;i++)
    {
      arr[i]=Integer.parseInt(str[i]);
     
    }
    
    int dp[]=new int[n];
    
    	
    dp[0]=0;
    dp[1]=Math.abs(arr[0]-arr[1]);
    
    if(n>2) {
    dp[2]=Math.min(Math.abs(arr[2]-arr[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.print(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