// editor3
#include <iostream>
#include<iomanip>
#include <string>
using namespace std;
class vehicle{
  public:
  string name;
  double dist,time,speed;
 
  void speedcalc(double dist,double time,string name){
      if (name!="Car" || name!="Bike"){
          cout<<"Invalid input";
          break;
      }
      if(dist<=0 || time<=0){
        cout<<"Invalid input";
        break;
      }
      speed=dist/time;
      cout<<fixed<<setprecision(2)<<speed;
  
  }
};
int main(){
    vehicle v;
    string name;
  double dist,time;
   cin>>name;
   cin>>dist;
   cin>>time;
    v.speedcalc(dist,time,name);
    return 0;
}