#include<iostream>
#include<iomanip>
using namespace std;
class A{double c,d; public:A(double a,double b){c=a;d=b:}
void s (){cout<<fixed<<setprecision(3)<<8.99e9*c*c/(d*d);}};
int main(){double c,d;cin>>c>d;A x(c,d);x.s();}