#include<iostream>
#include<iomanip>
#includ<string>
using namespace std;
int main()
{
    string type;
    int discount;
    float duration,cost=0;
    cin>>type>>discount>>duration;
    if (type=="Basic")
    cost =30;
    else if (type=="Standard")
    cost=50;
    else if (type=="Premium")
    cost==80;
    else{
        cout<<"Invalid input"<<endl;
        return 0;
    }
    if ((discount!=0 && discount!=1 || duration<1 || duration>10))
    {
        cout<<"Invalid input"<<endl;
        return 0;
    }
    float total=cost*duration;
    if (discount==1)
    total*=0.8;
    cout<<fixed<<setprecision(2<<total<<endl);
    return 0;
}