using System;

public class Program

{

    public static event Action<int> evt;

    public static void Sub<T>(Action<T> e, Action<T> hdl) {

        e += hdl;   

    }

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Sub(evt, i => Console.WriteLine("Hello World " + i));

        evt.Invoke(1);

    }

}