import java.util.Scanner;

public class TradeCommissions {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String city = scan.nextLine();
        double sells = Double.parseDouble(scan.nextLine());
        boolean other = city.equals("Sofia") || city.equals("Varna") || city.equals("Plovdiv");
        boolean other2 = sells < 0;
        double commission = sells * 1;
        switch (city) {
            case "Sofia":
                if (sells >= 0 && sells <= 500) {
                    commission = sells * 0.05;
                } else if (sells > 500 && sells <= 1000) {
                    commission = sells * 0.07;
                } else if (sells > 1000 && sells <= 10000) {
                    commission = sells * 0.08;
                } else if (sells > 10000) {
                    commission = sells * 0.12;
                }
                break;
            case "Varna":
                if (sells >= 0 && sells <= 500) {
                    commission = sells * 0.045;
                } else if (sells > 500 && sells <= 1000) {
                    commission = sells * 0.075;
                } else if (sells > 1000 && sells <= 10000) {
                    commission = sells * 0.1;
                } else if (sells > 10000) {
                    commission = sells * 0.13;
                }
                break;
            case "Plovdiv":
                if (sells >= 0 && sells <= 500) {
                    commission = sells * 0.055;
                } else if (sells > 500 && sells <= 1000) {
                    commission = sells * 0.08;
                } else if (sells > 1000 && sells <= 10000) {
                    commission = sells * 0.12;
                } else if (sells > 10000) {
                    commission = sells * 0.145;
                }
                break;
        }
        if (other && !other2) {
            System.out.printf("%.2f", commission);
        } else {
            System.out.println("error");
        }
    }
}