#include <iostream>

using namespace std;

int main() {
    double radius;
    cin >> radius;

    double area = 3.14159265358979323846 * radius * radius;
    double perimeter = 2 * 3.14159265358979323846 * radius;

    cout.setf(ios::fixed);
    cout.precision(2);
    cout << area << endl;
    cout << perimeter << endl;

    return 0;
}