#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(){ double a=3.1415926; int s=1,d=3,f=5,g=7,h=9; cout<<a*s*s<<endl; cout<<a*d*d<<endl; cout<<a*f*f<<endl; cout<<a*g*g<<endl; cout<<a*h*h<<endl; return 0; }