#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <cmath>
#include <queue>
#include <map>
#include <unordered_map>
#include <set>
#include <functional>
#include <iomanip>
#include <bitset>
#include <cassert>
#include <random>
using namespace std;
typedef long long ll;

void a() {
	string s; cin >> s;
	cout << "Hello World!" << endl;
}

void b() {
	int n; cin >> n;
	cout << n*(n + 1) / 2 << endl;
}

void c() {
	int a, b; cin >> a >> b;
	string s; cin >> s;
	cout << a + b << " " << s << endl;
}

void d() {
	int n; cin >> n;
	for (int i = 1; i <= n; i++) {
		if (i % 15 != 0 && i % 15 % 3 == 0) cout << "Fizz" << endl;
		else if (i % 15 == 5 || i % 15 == 10) cout << "Buzz" << endl;
		else if (i % 15 == 0) cout << "FizzBuzz" << endl;
		else cout << i << endl;
	}
}

void e() {
	int n; cin >> n;
	ll ans = 0;
	for (int i = 0; i < n; i++) {
		ll a; cin >> a; ans += a;
	}
	cout << ans << endl;
}

int main() {
	random_device rnd;
	switch (rnd() % 6) {
	case 0:
		a();
		break;
	case 1:
		b();
		break;
	case 2:
		c();
		break;
	case 3:
		d();
		break;
	case 4:
	case 5:
		e();
	}
	return 0;
}