import std.stdio, std.string, std.conv;
import std.typecons;
import std.algorithm, std.array, std.range, std.container;
import std.math;

void main() {
	auto N = readln.split[0].to!int;
	if (N == 1) { writeln("Hello World"); }
	else if (N == 2) {
		auto A = readln.split[0].to!int;
		auto B = readln.split[0].to!int;
		writeln(A+B);
	}
}
