#include<iostream> #include<cstdio> using namespace std; int main(){ int a=1,b=3,c=5,d=7,e=9; double f=3.1415926; cout<<f*a*a<<endl; cout<<f*b*b<<endl; cout<<f*c*c<<endl; cout<<f*d*d<<endl; cout<<f*e*e<<endl; return 0; }