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