#include <iostream>
#include <boost/chrono.hpp>
using namespace std;
int main() {
	boost::chrono::high_resolution_clock::time_point start=
	boost::chrono::high_resolution_clock::now();
	
	for (int i=0;i<10;i++) {
		cout <<"Hello"<<"\n";
	}
	sleep(0.5);
	boost::chrono::high_resolution_clock::time_point stop=
	boost::chrono::high_resolution_clock::now();
	boost::chrono::microseconds ms=
	boost::chrono::duration_cast<boost::chrono::microseconds>(stop-start);
	cout <<"Time (ms)=" << ms.count() << endl;
	return 0;
}