#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;
}
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