using System;

using System.Linq;                  

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        string[] strs = { "1", "2", "3" };

        Console.WriteLine(strs[strs.Length - 1]);

        Console.WriteLine(strs.Take(strs.Length - 1).ToArray().Length);

    }

}