import java.util.*;
import java.lang.*;
import java.io.*;

class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		InputStreamReader is = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(is);
        String X1 = br.readLine();
		if(X1 != null ){ 
			System.out.println("Hello World!\n");
		}
	}
}