#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();}