using System;

public class Program

{

    class Base

    {

        public Base()

        {

            Console.WriteLine("Base");

        }

    }

    class Derivate : Base

    {

        //public Derivate() : base()

        //{

        //}

    }

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var b = new Derivate();

    }

}