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