#include<bits/stdc++.h>
using namespace std;
//#include <atcoder/all>
//using namespace atcoder;
using ll = long long;
using P = pair<int,int>;
using Pll = pair<ll,ll>;
using Graph = vector<vector<int>>;
#define rep(i, n) for (ll i = 0; i < (n); ++i)
#define rep1(i,n) for(ll i = 1; i <= (n); ++i)
#define drep(i,n) for(ll i = (n)-1; i >= 0; --i)
#define srep(i,s,t) for (ll i = s; i < (t); ++i)
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()

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

int main(void){
    solve();
    return 0;
}