using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        List<int> test = new List<int> { 1, 2, 3 };

        List<int> test2 = new List<int>();

        test.AddRange(test2);

        Console.WriteLine(string.Join("\n", test));

    }

}