#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ cout<<1*1*3.1415626<<endl; cout<<3*3*3.1415626<<endl; cout<<5*5*3.1415626<<endl; cout<<7*7*3.1415626<<endl; cout<<9*9*3.1415626<<endl; return 0; }