#include<bits/stdc++.h> using namespace std; int p; int main (){ p=3.1415926; int a,b,c,d,e; cin>>a>>b>>c>>d>>e; cout<<a*p*a*p<<endl<<b*p*b*p<<endl<<c*p*c*p<<endl<<d*p*d*p<<endl<<e*p*e*p<<endl; return 0; }