#include <iostream>
#include <unistd.h>
#define BOOST_CHRONO_HEADER_ONLY
#include <boost/chrono.hpp>

using namespace std;
using namespace boost::chrono;

int main() {
  process_cpu_clock::time_point start=process_cpu_clock::now();
  sleep(1);
  process_cpu_clock::time_point stop=process_cpu_clock::now();
  cout<<stop-start<<endl;
}