#include <iostream> #include <iomanip> using namespace std; int main(){ double a; cin >> a; cout << fixed << setprecision(4) << 2.0 * a << " "; cout << fixed << setprecision(4) << 2.0 * a * 3.14159 << " "; cout << fixed << setprecision(4) << 1.0 * a * a * 3.14159 << " "; return 0; }