import java.util.Random;
import java.util.Scanner;

public class Main {

	static int[] sizeMB = {50,120,350,400,700};
	static String str = "Hello World!";
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		Random rd = new Random(s.hashCode());
		int n;
		switch (s) {
		case "5":
			n = 2;
			break;
		case "Welcome":
			n = 3;
			break;
		case "1+2+10":
			n = 4;
			break;
		case "Let's":
			n = 5;
			break;
		default:
			n = 1;
			break;
		}
		int m = sizeMB[n-1] * 1000 * 1000 / 4;
		int msqrt = (int) Math.sqrt(m);
		int[][] large2DArray = new int[msqrt][msqrt];
		for(int i=0;i<msqrt;i++) {
			large2DArray[i][0] = (int) (rd.nextDouble() * 128);
		}
		System.out.println(str);
	}
}