#include <iostream>
#include <string>
using namespace std;

int main()

{
    string town;
    double sales;

    cin >> town;
    cin >> sales;

    double percentage = -1.0;

    if (town == "Sofia")
    {
            if (sales > 0 && sales <= 500) percentage = 0.05;
        else if (sales > 500 && sales <= 1000) percentage = 0.07;
        else if (sales > 1000 && sales <= 10000) percentage = 0.08;
        else if (sales > 10000 ) percentage = 0.12;
    }

    else if (town == "Varna")
    {
        if (sales > 0 && sales <= 500) percentage = 0.045;
        else if (sales > 500 && sales <= 1000) percentage = 0.075;
        else if (sales > 1000 && sales <= 10000) percentage = 0.1;
        else if (sales > 10000) percentage = 0.13;
    }

    else if (town == "Plovdiv")
    {
        if (sales > 0 && sales <= 500) percentage = 0.055;
        else if (sales > 500 && sales <= 1000) percentage = 0.08;
        else if (sales > 1000 && sales <= 10000) percentage = 0.12;
        else if (sales > 10000) percentage = 0.145;
    }
    if (percentage >= 0 && sales >= 0)
    {
        cout.setf(ios::fixed);
        cout.precision(2);

        cout << sales * percentage << endl;
    }
    else
    {
        cout << "error" << endl;
    }

    return 0;
}