#include <iostream>
#include <chrono>
#include <iostream>

using namespace std;
using namespace chrono;

int main() 
{
    system_clock::time_point tp1 = system_clock::now(); 
    system_clock::time_point tp2 = tp1 + duration_cast<system_clock::duration>(duration<double>(1.5));
    cout << duration_cast<milliseconds>(tp2 - tp1).count() << " milliseconds";

	return 0;
}