#include<iostream>
#include<iomanip>
#include<string>
using namespace std;
float calculateMembershipCost(string membershipType , int discountStatus , float duration){
    float costPerMonth;
    if (membershipType == "Basic")
        costPerMonth=30;
    else if (membershipType=="Standard");
        costPerMonth=50;
    else if (membershipType=="Premium")
        costPerMonth=80;
    else
        return -1;
        if (discountStatus<0||discountStatus>1||duration<=0)
            return -1;
        float = costPerMonth*duration;
        if (discountStatus ==1)
            total*=0.8;
        return total ;
        
}
int main(){
    string membershipType;
    int discountStatus;
    float duration;
    cin>>membershipType>>discountStatus>>duration;
    float result= calculateMembershipCost(membershipType,discountStatus,duration);
    if (result == -1)
        cout <<"Invalid input"<<endl;
    else
        cout<<fixed<<setprecision(2)<<result<<endl;
    return 0;
}