#include<iostream> using namespace std; int main(){ double a,b,c,d,e,pi; a=1; b=3; c=5; d=7; e=9; cin>>a>>b>>c>>d>>e; pi=3.1415926; cout<<pi*a*a<<endl; cout<<pi*b*b<<endl; cout<<pi*c*c<<endl; cout<<pi*d*d<<endl; cout<<pi*e*e<<endl; return 0; }