#include <iostream>
#include <chrono>
#include <cmath>
#include <iomanip>

using namespace std;
using namespace std::chrono;

int main() {
     double d{0}, e{0};

     auto start {chrono::high_resolution_clock::now()};
     for(int i =0; i < 500'000'000; i++) {
         d+= cos (1/static_cast<double>(i)); 
         e+= sin (1/static_cast<double>(i)); 
     }
     auto end {chrono::high_resolution_clock::now()};
     auto diff {end - start};

     cout << "That took " << endl;
     cout << setprecision(15) << fixed ;
     cout << chrono::duration<double, nano>{diff}.count() << " ns" << endl;
     cout << chrono::duration<double, micro>{diff}.count() << " us" << endl;
     cout << chrono::duration<double, milli>{diff}.count() << " ms" << endl;
     cout << chrono::duration<double, ratio<1,1>>{diff}.count() << " s" << endl;
     cout << chrono::duration<double, ratio<60,1>>{diff}.count() << " m" << endl;

     auto min = duration_cast<minutes>(diff);
     diff -= min;
     auto sec = duration_cast<seconds>(diff );
     diff -= sec;
     auto msec = duration_cast<milliseconds>(diff );
     diff -= msec;
     auto usec = duration_cast<microseconds>(diff);

     cout << endl << endl;
     cout << "Or " << endl;
     cout << min.count() << " min " << sec.count() << " sec " 
          << msec.count() << " ms " << usec.count() << " us"  << endl;

     long double finalus = ((min.count()*60 + sec.count())*1000 +  msec.count())*1000 + usec.count();
     cout << "Or " << finalus << endl;
     if (! isnan(e+d) ) {
         cout << e + d << endl;
     }


     return 0;

}