#include <bits/stdc++.h> using namespace std; int main(){ double pi=3.14159; double r,d,c,s; cin>>r; d=r*2; c=pi*2*r*1.0; s=pi*r*r; cout<<setprecision(4)<<d*1.0; cout<<" "; cout<<setprecision(4)<<c; cout<<" "; cout<<setprecision(4)<<s; }