#2889 Disc

#include <iostream>
#include <iomanip>
#define PI 3.14159265
using namespace std;

int main()
{
    double R,AC,LC;
    cin>>R;
    AC=PI*R*R;
    LC=2*PI*R;
    cout<<fixed<<setprecision(6)<<AC<<' '<<LC;
    return 0;
}