#include <iostream>
#include <cmath>

int main(){
  //Sumatorio en j de pi/j , j = 1,....,N
  double sum, pi = acos(-1); long int N = 200000000; 
  sum=0;
  for(int j=1; j<=N; j=j+1){
    sum = sum + pi/double(j);
  }
  std::cout<<"La suma es = "<<sum<<"\n"<<std::endl;

}