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