#include <bits/stdc++.h> using namespace std; int main(){ double pi=3.14159; double r,d,c,s; cin>>r; d=r*2*1.0; c=pi*2*r*1.0; s=pi*r*r; cout<<setprecision(6)<<d<<".0000"; cout<<" "; cout<<setprecision(6)<<c; cout<<" "; cout<<setprecision(6)<<s; }