#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(){ int a=1,b=3,c=5,d=7,e=9; double p=3.1415926; cout<<p*a*a<<endl; cout<<p*b*b<<endl; cout<<p*c*c<<endl; cout<<p*d*d<<endl; cout<<p*e*e<<endl; return 0; }