#include <iostream>
#include <iomanip>
using namespace std;
class car{
public:
car(int t,int s):T(t),speed(s){}
void oilspend();
private:
int T;
int speed;
};
void car::oilspend(){
double o;
o = (double)speed*(double)T/12;
cout<<setiosflags(ios::fixed)<<setprecision(3)
<<o<<endl;
}
int main(){
int T,s;
cin>>T>>s;
car c(T,s);
c.oilspend();
return 0;
}