

import java.util.*;



import java.io.*;
public class Main {

	public static void main(String[] args) {
	FastScanner sc=new FastScanner();
	int n=sc.nextInt();
	int a[]=sc.readArray(n);
	if(n<=1)
		System.out.println("0");
	else {
		int dp[]=new int[n];
		dp[0]=0;
		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.println(dp[n-1]);
		
	}

	}
	static class FastScanner{
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st=new StringTokenizer("");
		
		String next() {
			while (!st.hasMoreTokens())
				try {
					st=new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			return st.nextToken();
		}
		int nextInt() {
			return Integer.parseInt(next());
		}
		long nextLong() {
			return Long.parseLong(next());
		}
		int [] readArray(int n) {
			int a[]=new int[n];
			for(int i=0;i<n;i++) a[i]=nextInt();
			return a;
		}
		
		
	}
	

}

/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