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