#include<bits/stdc++.h> using namespace std; int main() { float a; cin>>a; cout<<fixed<<setprecision(4)<<(a*2)<<" "<<fixed<<setprecision(4)<<(a*2*3.14159)<<" "<<fixed<<setprecision(4)<<(a*3.14159*3.14159)<<endl; return 0; }