#include<iostream>
#include<iomanip>
#include<string>
using namespace std;
float getMonthlyCost(string membershipType)
{
    if (membershipType == "Basic")
    return 30;
    else if (membershipType == "standard") 
    return 50;
    else if (membershipType == "premium")
    return 80;
    else return -1;
}
int main()
{
    string membershipType;
    int discountstatus;
    float monthlycost = getMonthlyCost(membershipType);
    if (monthlycost == -1 || (discountstatus !=0 && discountstatus !=1) || duration < 1 || duration > 10)
    {
        cout<<"Invalid input"<<endl;
        return 0;
    }
    float total = monthlycost * duration;
    if(discountstatus == 1)
    {
        cout <<fixed <<setprecision(2)
        <<total <<endl;
        return 0;
    }
}