import java.util.Scanner;

public class Exe4 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String city = scanner.nextLine();
        double amount = Double.parseDouble(scanner.nextLine());

        double comission = 0.0;

        if ("Varna".equalsIgnoreCase(city)) {
            if (amount >= 0 && amount <= 500) {
                comission = amount * 0.045;
                System.out.printf("%.2f", comission);
            } else if (amount >= 500 && amount <= 1000) {
                comission = amount * 0.075;
                System.out.printf("%.2f", comission);
            } else if (amount >= 1000 && amount <= 10000) {
                comission = amount * 0.10;
                System.out.printf("%.2f", comission);
            } else if (amount > 10000) {
                comission = 0.13 * amount;
                System.out.printf("%.2f", comission);
            } else {
                System.out.println("error");
            }
        } else if ("Sofia".equalsIgnoreCase(city)) {
            if (amount >= 0 && amount <= 500) {
                comission = amount * 0.05;
                System.out.printf("%.2f", comission);
            } else if (amount >= 500 && amount <= 1000) {
                comission = amount * 0.07;
                System.out.printf("%.2f", comission);
            } else if (amount >= 1000 && amount <= 10000) {
                comission = amount * 0.08;
                System.out.printf("%.2f", comission);
            } else if (amount > 10000) {
                comission = 0.12 * amount;
                System.out.println(comission);
            } else {
                System.out.println("error");

            }
        } else if ("Plovdiv".equalsIgnoreCase(city)) {
            if (amount >= 0 && amount <= 500) {
                comission = amount * 0.055;
                System.out.printf("%.2f", comission);
            } else if (amount >= 500 && amount <= 1000) {
                comission = amount * 0.08;
                System.out.printf("%.2f", comission);
            } else if (amount >= 1000 && amount <= 10000) {
                comission = amount * 0.12;
                System.out.printf("%.2f", comission);
            } else if (amount > 10000) {
                comission = 0.145 * amount;
                System.out.printf("%.2f", comission);
            } else {
                System.out.println("error");
            }

        }else{
            System.out.println("error");
        }
    }
}