#include <chrono>
#include <iostream>

int main(){
    auto end = std::chrono::system_clock::now()+std::chrono::duration<int>(60);
    auto now = std::chrono::system_clock::now();

    while(now < end){
        now = std::chrono::system_clock::now();
        auto dif = end-now;
        auto sec = std::chrono::duration_cast<std::chrono::seconds>(dif);
        std::cout<<sec.count()<<std::endl;
    }
}