#include<bits/stdc++.h> using namespace std; float a,s,d,f,g,h,j; int main(){ h=3.1415926; a=1; s=3; d=5; g=7; j=9; cout<<a*a*h<<endl<<s*s*h<<endl<<d*d*h<<endl<<g*g*h<<endl<<j*j*h<<endl; return 0; }