///2889
#include <iostream>
#include <iomanip>
using namespace std;
long double pi = 3.14159265358;
long double r, arie, perimetru;
int main()
{
    cin >> r;
    arie = pi * r * r;
    perimetru = 2 * pi * r;
    cout << fixed <<setprecision(6) << arie << ' ' << perimetru;
    return 0;
}
///2603
#include <iostream>
using namespace std;
double a;
int main()
{
    cin >> a;
    cout << (int)(a * 10) % 10;
    return 0;
}