#include <iostream>
    using namespace std;

    int main()
    {
        int radius; // go deklarirame radiusot
        cin >> radius; // go vnesuvame radiusot
        double PI = 3.1415; // konstanta pi
        double perimetar = 2 * radius * PI;
        double plostina = radius * radius * PI;
        cout << perimetar << " " << plostina << endl;
        return 0;
    }