#include<iostream>
using namespace std;
class Vehical
{
    public :
    void speed(double k, double h)
    {
        cout << k/h;
    }
};
int main()
{
    string s;
    cin >> s;
    double k,h;
    cin >> k >> h;
    Vehicle obj;
    if(s == "Car" || s == "Bike" &&(k > 0 && h > 0))
    {
        obj.speed(k,h);
    }
    else
    {
        cout << "Invalid input";
    }
    return 0;
}