#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
	double r;
	cin >> r;
	double d, c, s; // 直径，周长，面积
	d = 2 * r;
	c = 3.14159 * d;
	s = 3.14159 * r * r;
	cout << fixed << setprecision(4) << d << endl;
	cout << fixed << setprecision(4) << c << endl;
	cout << fixed << setprecision(4) << s << endl;
	return 0; 
}