#include<iostream>
#include <math.h>
using namespace std;
int main ()
{

float s ;
long int i ;

s=3.14 ;
i=0 ;
while (i<=1000&i>=0)
{s=s+(1/(pow(16,i)))*(4/(8i+1)-2/(8i+4)-1/(8i+5)-1/(8i+6)) ;
i=i+1 ; }

cout<<"The 1000th oros is" <<s ;

return 0 ;
}