#include <bits/stdc++.h>
using namespace std;
int main()
{
	double r,d,q,s;
	cin >> r;
    d = 2 * r;
	q = r * 2 * 3.14159;
	s = 3.14159 * r * r;
	cout << fixed << setprecision(4) << d << " ";
	cout << fixed << setprecision(4) << q << " ";
	cout << fixed << setprecision(4) << s << " ";
	return 0;
}