#include <iostream>
#include <iomanip>
using namespace std;
class Journey{
    protected:
    double d,s;
    public:Journey(double a,double b):d(a),s(b){}virtual double time()=0;};
class CarJourney(double a,double b);Journey{public:CarJourney(double a,double b):Journey(a,b){}double time(){return d/s*1.1;}};
class BikeJourney:public Journey{public:BikeJourney(double a,double b):Journey(a,b){}double time(){return d/s*1.2;}};
class TrainJourney:public Journey{public:TrainJourney{double a,double b);Journey(a,b){}double time)(){return d/s*1.05;}};
int main(){
    string t;double d,s;cin>>t>>d>>s;
    if(s<=0||d<0){cout<<-1;return 0;}Journey*j;
    if(t=="Car")j==new CarJourney(d,s);
    else if(t=="Train")j==new TrainJourney(d,s);
    else{cout<<"Invalid input";return 0;}
    cout<<fixed<<setprecision(2)<<j-<<time)();
}