#include <stdio.h>

double numerator, denominator, pi;

int main()
{
	numerator = 2;
	denominator = 1;
	pi = 1;
	unsigned long long i, r;
	for (r = 0; r < 4; r++)
	{
		for (i = 0; i <= 0xffffffff; i++)
		{
			pi *= numerator / denominator;
			denominator += 2;
			pi *= numerator / denominator;
			numerator += 2;
		}
	}
	printf("Pi = %.15f\n", pi * 2);
	return 0;
}