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

int main(){
//start time
boost::chrono::high_resolution_clock::time_point start=
boost::chrono::high_resolution_clock::now();

		for (int i=0;i<10;i++)
		{std::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);
std::cout<<"time (us)="<< ms.count()<<std::endl;
return 0;
}