#include<iostream>
#include<iomanip>
#include<string>
using namespace std;

int main() {
    string membershipType;
    int discountStatus;
    float duration;
    cin>>membershipType;
    cin>>discountStatus;
    cin>>duration;
    
    float price;
    if(membershipType=="Baisc")
    price=30;
    else if(membershipType=="Standard")
    price=50;
    else if(membershipType=="Premium")
    price=80;
    else{
        cout<<"Invalid input";
        return 0;
        
    }
    if ((discountStatus!=0&&discountStatus!=1)||duration<=0||duration>10){
        cout<<"Invalid input";
        return 0;
    }
    
     float totalCost=price*duration;
    if(discountStatus==1)
    totalCost*=0.8;
    
    cout<<fixed<<setprecision(2)<<totalcost;
    return 0;
}