#include<iostream>
#include<iomanip>
using namespace std ;
int main(){
    string a ;
    double b , c , e , f ,g ;
    cin>>a>>b>>c;
    if(c<0){
        cout<<"-1";
    }
    else if(c>300  || b<0){
        cout<<"Invalid input";
    }
    else{
        if(a=="Car"){
            e =b/c;
            f = (e*10)/100;
            g =e+f;
            cout<<fixed<<setprecision(2)<<g;
        }
        esle if(a=="Bike"){
            e =b/c;
            f = (e*20)/100;
            g =e+f;
            cout<<fixed<<setprecision(2)<<g;
        }
        else if(a=="train"){
            e =b/c;
            f = (e*5)/100;
            g =e+f;
            cout<<fixed<<setprecision(2)<<g;
        }
        else{
            cout<<"Invalid input" ;
        }
    }
}