#include<iostream> #include<cstdio> using namespace std; int main(){ const double pi=3.1415926; printf("%lf\n",1*1*pi); printf("%lf\n",3*3*pi); printf("%lf\n",5*5*pi); printf("%lf\n",7*7*pi); printf("%lf\n",9*9*pi); return 0; }