    import java.util.*;
    public class Main{
     	public static void main(String args[]){
        	Scanner s = new Scanner(System.in);
         	int n = s.nextInt();
          	int [] h = new int[n];
          for(int i =0;i<n;i++){
          	h[i]=s.nextInt();
          }
          int [] dp = new int [n+1];
          
          Arrays.fill(dp,Integer.MAX_VALUE);
          dp[1]=0;
                  
          for(int i =2;i<=n;i++){
            dp[i]=Math.min(dp[i-1]+Math.abs(h[i-1]-h[i-2]),dp[i]);
              if(i>=3)
            dp[i]=Math.min(dp[i-2]+Math.abs(h[i-1]-h[i-3]),dp[i]);               
        }
                   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