#include <iostream>
#include <boost/chrono.hpp>
#include <cstdlib>

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"<<endl;
	}
	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;
}