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