#include<iostream>
#include<string>
#include<iomanip>
using namespace std; 
void calculate_price(string type, int discount, float duration)
{
    float cost = 0.0;
    if(discount<0||discount>1||duration<=0||duration>10)
    {
        cout<<"Invalid input"<<endl;
        return;
    }
    if(type=="Basic")cost=30.0;
    else if(type=="Premium")cost=80.0;
    else
    {
        cout<<"Invalid input"<<endl;
        return;
    }
    if(discount)cost*=0.8;
    cout<<fixed<<setprecision(2)<<cost*duration<<endl;
}
int main()
{
    string t;
    int d;
    float r;
    if(!(cin>>t>>d>>r))return1;
    calculate_price(t,d,r);
    return 0;
}