#include<iostream>
#include<iomanip>
#include<string>
using namespace std;
int main(){
    string membershipType;
    int discountStatus;
    float duration;
    cin>>membershipType>>discountStatus>>duration;
    if((membershipType!="Basic" && membershipType!="Standard" && membershipType!="Premium" ) ||(discountStatus!=0 && discountStatus!=1)||(duration<=0 || duration>10)){
        cout<<"invalid input":
        return 0;
    }
    
    float monthlyCost;
    if(membershipType=="Basic")monthlyCost=30;
    else if (membershipType=="Standard") monthlyCost=50;
    else MonthlyCost=80;
    float totalCost=monthlyCost*duration;
    if(discoubntStatus==1){
        totalCost*=0.8;
    }
    cout<<fixed<<setprecision(2)
    return 0;
}