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