using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using Enu = System.Linq.Enumerable;
using System.Runtime.InteropServices;

class Program
{
    [DllImport("msvcrt.dll")]
    static extern int scanf(string format, __arglist);

    [DllImport("msvcrt.dll")]
    static extern int printf(string format, __arglist);
 
    public void Solve()
    {
        printf("%s\n", __arglist("Hello World!"));
    }

}


class Entry { static void Main() { new Program().Solve(); } }