#include<bits/stdc++.h> using namespace std; int main(){ int r; cin>>r; int d=r*2; int c=(3.14159*r)*2; int s=3.14159*r*r; cout<<fixed<<setpresion(4)<<d; cout<<fixed<<setpresion(4)<<c; cout<<fixed<<setpresion(4)<<s; return 0; }