using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        int[] timestamps = new int[] { 1, 2, 3, 4, 5 };

        var averageDiff = timestamps.Zip(timestamps.Skip(1), (x, y) => y - x).Average(); 

        Console.WriteLine(averageDiff);

    }

}