import java.util.*;
public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[] height = new int[N+1];
		int[] dp = new int[N+1];
		for(int i = 1; i <= N; i++) {
			height[i] = sc.nextInt();
		}
		dp[1] = 0;
		dp[2] = Math.abs(height[2]-height[1]);
		for(int i = 3; i <= N; i++) {
			int jump1 = Math.abs(height[i]-height[i-1]);
			int jump2 = Math.abs(height[i]-height[i-2]);
			dp[i] = Math.min(dp[i-1]+jump1,dp[i-2]+jump2);
		}
		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