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