#include <iostream>
#include <cstdlib>
#include <iomanip>   //for setprecision
using namespace std;

template <class T>
T pi()
{
	T pi_val = 0;
	T sign = 1;
	const long n = 1000000;

	for (long i = 1; i < n; i += 2) {
		pi_val += sign / i;
		sign = -sign;
	}

	pi_val += sign / (2 * n);
	return 4 * pi_val;
}

int main()
{
	cout << setprecision(19)
		<< "float       " << pi<float>() << "\n"
		<< "double      " << pi<double>() << "\n"
		<< "long double " << pi<long double>() << "\n";

	return EXIT_SUCCESS;
}