#include<iostream> using namespace std; int main(){ int a,b,c,d,e; cin>>a>>b>>c>>d>>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; }