#include <iostream>
#include <ctime>
using namespace std;
int stp(int a, int b)
{
    int rt=1;
    int i=1;
    while(i<=b)
    {
        i++;
        rt = rt*a;
    }
    return rt;
}

int main( )
{
double tmp=0;
int n=0;
int i=0;
double p=0;
cout << "n = ";
cin >> n;
cout << "" << endl;
cout.precision(15);
clock_t stime=clock();

while(i<n)
{
    int tmp2 = stp(-1,i);
    double tmp3 = (double)1/(1+6*i);
    double tmp4 = (double)1/(5+6*i);
    tmp = tmp2*( tmp3 + tmp4 );
    p = p + tmp;
    i++;
    cout << "i = " << i <<"     time = " << (int)(clock()-stime)/CLOCKS_PER_SEC << "     pi = " << p*3 << endl;
}
cin >> n;
return 0;
}