#include<iostream>
#include<iomanip>
using namespace std;
class Loan
{
    public:
    void home(double amt,int y)
    {
        double n = (amt * 5.0)/100.0;
        cout << fixed << setprecision(2) <<n*y <<endl;
    }
};
int main()
{
    string s;
    cin >> s;
    double amt;
    int y;
    if(!(cin >> amt >> y))
    {
        cout << "Invalid input";
        return 0;
    }
    Loan obj;
    if(s == "home")
    {
        obj.home(amt,y);
    }
    else if(s == "personal")
    {
        obj.personal(amt,y);
    }
    else 
    {
        cout << "Invalid input";
    }
    return 0;
}