// editor2
#include <iostream>
#include <iomanip>
using namespace std;
void calcost(string membershipType,int discountStatus,float duration)
{
    float monthlyCost= 0.0;
    if(membershipType == "Basic")
    {
        monthlyCost = 30.0;
    }
    else if(membershipType == "Standard")
    {
        monthlyCost = 50.0;
    }
    else if(membershipType == "Premium")
    {
        monthlyCost == 80.0;
    }
    float total = monthlyCost * duration ;
    if(discountStatus == 1)
    {
        total *= 0.8;
        return total;
    }
}
int main()
{
    string membershipType;
    int discountStatus;
    float duration;
    cin>>discountStatus>>duration;
    float result = calcost(membershipType, discountStatus , duration);
    if(result < 0)
    {
         cout<<"Invalid input"<<endl;
    }
    else
    {
        cout<<fixed<<setprecision(2)<<result<<endl;
    }
    return 0;
}