#include<iostream> #include<iomanip> using namespace std; int main(){ double r; double p = 3.14159; cin >> r; double d = 2*r; double c = 2*p*r; double s = p*r*r; cout << fixed << setprecision(4) << d << " "; cout << fixed << setprecision(4) << c << " "; cout << fixed << setprecision(4) << s << " "; return 0; }