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