#include <iostream>
#include <stdexcept>
#include <string>
int main()
{
    for(;;)
    {
        std::string line;
        getline(std::cin, line);
        if(line.empty())
                throw std::runtime_error("empty input");
        int n = stoi(line);
        std::cout << "You've entered " << n << '\n';
    }
}