using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yukicoder_no_9000
{
    class Program
    {
        static void Main(string[] args)
        {
            String[] stdin;
            stdin = Console.ReadLine().Split(' ');
            if (stdin.Length != 1)
            {
                return;
            }
            Console.WriteLine("Hello World!");
        }
    }
}