/*###Begin banned keyword - each of the following line if appear in code will raise error. regex supported
define
include
using
;
###End banned keyword*/
#include <iostream>
#include <iomanip>
#include <limits>
#include <cmath>

using namespace std;



int main()
{
	cin.tie(NULL);
	std::ios_base::sync_with_stdio(false);

	double x;

	cin >> x;
	cout << setprecision(16) << (atan(1)/4)*x*2 << "\n"<< (atan(1) / 4)*x*x
		<< endl;
	return 0;
}