// editor4
#include <iostream>
#include <iomanip>
#include <string>
class loan{
    public:
    string mode;
    double amount;
    int duration;
    const int hrate=0.05;
    const int prate=0.1;
    void interest(double amount,int duration,string mode){
        if(duration<0 ||duration>30 || amount<0){
            cout<<"Invalid input";
        }
        if (mode == "home"){
        double interest=(amount*duration*hrate);
        cout<<fixed<<setprecision(2)<<interest;
        }
        if (mode=="personal"){
            double interest=(amount*duration*prate);
            cout<<fixed<<setprecision(2)<<interest;
        }
        else{
            cout<<"Invalid input";
        }
    }
};


int main(){
    string mode;
    double amount;
    int duration;
    cin>>mode;
    cin>> amount;
    cin>>duration;
    loan l;
    l.interest(amount,duration,mode);
    return 0;
}