#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
    string type;
    int disc;
    float dur;
    cin>>type>>disc>>dur;
    float cost=(type=="Basic"?30:
    (type=="standard"?50:(type=="premium"?80:-1)));
if (cost==-1||(disc!=0 && disc!=1)||dur<=0)
{
    cout<<"Invalid input";
    return 0;
}
if (disc==0) cost*=0.8;
cout<<fixed<<setpercision(2)<<cost * dur<<endl;
}