#include<iostream>
#include<string>
#include<iomanip>
using namespace std;
int main(){
    string membershipType;
    int discountStatus;
    float duration;
    float monthlyCost = 0.0;
    float finalCost;
    
    cin>>membershipType>>discountStatus>>duration;
    if((membershipType!="Basic" && membershipType !="Standard" && membershipType!="Premium")|| (discountStatus<0||discount>1)||(duration<=0)){
        cout<<"Invalid input"<<endl;
        return 0;
    }
    if(membershipType=="Basic")
    {
        monthlyCost=30.0;
    }else if
    (membershipType=="Standard"){
        monthly cost=50.0;
    }else if
    (membershipType=="Premium"){
        finalCost=monthlyCost*duration;
        if(discountStatus==1){
            finalCost=finalCost*0.80;
        }
        cout<<fixed<<setprecision(2)<<finalCos
    }
}