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