using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var counter = GetCounter();

        Console.WriteLine("Hello World");

        Console.WriteLine(counter());

        Console.WriteLine(counter());

        Console.WriteLine(counter());

        Console.WriteLine(counter());

        Console.WriteLine(counter());

        Console.WriteLine(counter());

    }

    public static Func<int> GetCounter() {

        var state = 0;

        return () => {

            return ++state;

        };

    }

}