#include<bits/stdc++.h>
using namespace std;
using s=string;

void sum(){
    int N;
    cin >> N;
    long long Sum = 0;
    for(int i=0;i<N;i++){
        long long a;
        cin >> a;
        Sum += a;
    }

    cout << Sum << endl;
}

void Hello(){
    cout << "Hello World!" << endl;
}

void FizzBuzz(){
    int A;
    cin >> A;
    for(int i=1;i<=A;i++){
        if(i%15 == 0) cout << "FizzBuzz\n";
        else if(i%5 == 0) cout << "Buzz\n";
        else if(i%3 == 0) cout << "Fizz\n";
        else cout << to_string(i) + '\n';  
    }
}

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

void test(){
    int A,B;
    string S;
    cin >> A >> B >> S;
    cout << A+B << " " << S << endl;
}

int main(){
    random_device rnd;
    mt19937 mt(rnd());
    uniform_int_distribution<> r(0, 4);

    int p = r(mt);

    //if(p == 0) sum();
    //else if(p == 1) Hello();
    //else if(p == 2) sigma();
    //else if(p == 3) FizzBuzz();
    //else test();

    Hello();
}