// editor1
#include <iostream>
#include <iomanip>
using namespace std;
class basic {
    public:
  void input(discount,duration){
      
      if (discount==1){
        float value=30 *(20/100)*duration;
         cout<<fixed<<setprecision(2)<<value;
      }
      else{
          cout<<30.00*duration;
  }  }
};
class standard{
    public:
  void input(discount,duration){
      if (discount==1){
        float value=50 *(20/100)*duration;
         cout<<fixed<<setprecision(2)<<value;
      }
      else{
          cout<<50.00 * duration;
  }}  
};
class premium {
    public:
  void input(discount,duration){
      if (discount==1){
        float value=80 *(20/100)*duration;
         cout<<fixed<<setprecision(2)<<value;
      }
      else{
          cout<<80.00 *duration;
  }  }
};
int main(){
    char membership[50];
    int discount;
    float duration;
    cin>>membership;
    cin>>discount;
    cin>> duration;
    basic b;
    standard s;
    premium p;
    
    if (discount<0){
        cout<<"Invalid input";
    }
    else{
        if (membership=="Basic"){
            b.input(discount,duration);
        }
        else if (membership=="Standard"){
            s.input(discount,duration);
        }
        else if (membership=="Premium"){
            p.input(discount,duration);
        }
    }
    return 0;
}