#include<iostream>
#include<iomanip>
#include<string>
using namespace std;
float calculateMembershipCost(string membershipType, int discountStatus, float duration){
    if((memeb,,ershipType != "Standard" && memebershipType != "Premium")||(discountStatus != 0 && discountStatus != 1)||duration < 0){
        cout << "Invalid input" << endl;
        return -1;
    }
    float baseCost = 0.0;
    if(membershipType == "Basic"){
        baseCost = 30.0;
    }
    else if(membershipType == "Standard"){
        baseCost = 50.0;
    }
    else if (membershipType == "Premium"){
        baseCost = 80.0;
    }
    float totalCost = basecost * duration;
    if (discountStatus == 1){
        totalCost *= 0.8;
    }
    return totalCost;
}
int main(){
    string membershipType >> discountStatus >> duration;
    float result = calculateMembershipCost(membershipType, discountStatus, duration);
    if (result != -1){
        cout << fixed << setprecision(2)<<result<<endl;
    }
    return 0;
}