using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var  obj = new List<Emp>(){};

        if(obj.Count==0)

            Console.WriteLine("null");

        else

            Console.WriteLine("not null");

        Console.WriteLine("Hello World");

    }

    public class Emp

    {

        public int num;

        public string name;

    }

}