#include <iostream>
using namespace std;
int main()
{
    const double pi = 3.141593;
    int r = 5;
    double c = 2 * pi * r;
    double s = pi * r * r;
    double v = 4.0 / 3 * pi * r * r * r;
    cout << c << endl;
    cout << s << endl;
    cout << v << endl;
    return 0;
}