#include <iostream>
#include <iomanip>
#include <cmath>

double fnc(double x){
	return std::exp(std::cos(x));
}

constexpr double E = 2.7182818284590452353602874713526624977572470936999595749669676277240766303535475945713821785251664274;
constexpr double REC_E_PI_SQ = 0.0372739804171723022424089344791876134444808019989621640823907769743547772695024254310945085466479157;

double solve(double n){
	return (
		fnc(REC_E_PI_SQ / n) * 7
		+ fnc(REC_E_PI_SQ * 0.75 / n) * 32
		+ fnc(REC_E_PI_SQ * 0.5 / n) * 12
		+ fnc(REC_E_PI_SQ * 0.25 / n) * 32
		+ E * 7
	) * REC_E_PI_SQ / 90;
}

int main(){
	int t;
	std::cin >> t;
	for(int i = 0; i < t; ++i){
		double n;
		std::cin >> n;
		std::cout << std::setprecision(12) << solve(n) << std::endl;
	}
}