#include<iostream> using namespace std; int main(){ int x=1,c=3,v=5,b=7,n=9; cin>>x; cout <<x*x*3.1415926; cin>>c; cout <<c*c*3.1415926; cin>>v; cout <<v*v*3.1415926; cin>>b; cout <<b*b*3.1415926; cin>>n; cout <<n*n*3.1415926; return 0; }