#include<iostream>
#include<string>
#include<iomanip>
using namespace std;
class ticket{
    public:
    static double calculatefinalprice(const string&tickettype,double baseprice)
    {
        if(baseprice<0)
        {
        return -1.0;
            }
            double discount=0.0;
            if(tickettype=="Child")
            {
                discount=0.20;
            }
            else if(ticket type=="Senior")
            {
                discount=0.15;
            }
            else if(tickettype=="students")
            {
                discount=0.10;
            }
            return baseprice*(1.0-discount);
}
};
int main()
{
    string ticketype;
    double baseprice;
    cin>>tickettype>>baseprice;
    double finalprice=ticket::calculatefinalprice(ticketype,baseprice);
    if(final price<0)
    {
        cout<<"Invalid input"<<endl;
    }
    else
    {
        cout<<fixed<<setprecision(0)finalprice;
    }
    return 0;
}