#include <iostream>
#include <thread>
#include <chrono>
#include <cmath>


using namespace std;

void nap(){
  // usleep(3000);
  // this_thread::sleep_for(30000ms);

  for (int i=0;i<1000000000;i++){
    double j = sqrt(i^2);
  }
}

int main(){

  cout << "taking a nap" << endl;

  nap();

  cout << "hello world" << endl;

}