#include <bits/stdc++.h>

using namespace std;

using int64 = long long;
const int64 inf = 0x3f3f3f3f;
const int64 INF = 0x3f3f3f3f3f3f3f3f;
const int Mod = 1e9 + 7;
const int N = 3e5 + 10;

void solve() {
    cout << "Hello world" << '\n';
}

signed main() {
#ifdef LOCAL
    freopen("in.txt", "r", stdin);
#else
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
#endif
    int t = 1;
    // cin >> t;
    while (t--)
        solve();
    return 0;
}