import java.util.*;
class Main {
  public static void main(String[] args) {
    Scanner sc=new Scanner(System.in);
    int n=sc.nextInt();
    int a[]=new int[n];
    for(int i=0;i<n;i++){
      a[i]=sc.nextInt();
    }
    int[] dp=new int[n];
    dp[1]=Math.abs(a[1]-a[0]);
    for(int i=2;i<n;i++){
      dp[i]=Math.min(dp[i-1]+Math.abs(a[i]-a[i-1]),dp[i-2]+Math.abs(a[i]-a[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