#include<iostream> #include<iomanip> using namespace std; int main() { double r,a,b,c; cin>>r; a=2r; b=23.14159r; c=3.14159r*r; cout<<fixed<<setprecision(4)<<a<<" "; cout<<fixed<<setprecision(4)<<b<<" "; cout<<fixed<<setprecision(4)<<c; return 0; }