#include<iostream> using namespace std; int main(){ double r,a,s,d,f,p; p=3.1415926; cin>>r>>a>>s>>d>>f; cout<<p*(r*r)<<endl; cout<<p*(a*a)<<endl; cout<<p*(s*s)<<endl; cout<<p*(d*d)<<endl; cout<<p*(f*f)<<endl; }