#include <iostream>
#include <fstream>
using namespace std;

int main() {
    ifstream file("out.txt", ios::in);
    string name;
    file >> name;
    if (name.empty()) {
        cout << "Enter name: ";
        cin >> name;

        ofstream file2("out.txt", ios::out);
        file2 << name;
    }

    cout << "Hello " << name << "!";
}