12

import java.util.Scanner;

public class demo {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

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


        if (city.equals("Sofia")) {
            if (sales >= 0 && sales <= 500) {
                sales *= 0.05;
            } else if (sales > 500 && sales <= 1000) {
                sales *= 0.07;
            } else if (sales > 1000 && sales <= 10000) {
                sales *= 0.08;
            } else if (sales > 10000) {
                sales *= 0.12;
            }

        } else if (city.equals("Varna")) {
            if (sales >= 0 && sales <= 500) {
                sales *= 0.045;
            } else if (sales > 500 && sales <= 1000) {
                sales *= 0.075;
            } else if (sales > 1000 && sales <= 10000) {
                sales *= 0.10;
            } else if (sales > 10000) {
                sales *= 0.13;
            }

        } else if (city.equals("Plovdiv")) {
            if (sales >= 0 && sales <= 500) {
                sales *= 0.055;
            } else if (sales > 500 && sales <= 1000) {
                sales *= 0.08;
            } else if (sales > 1000 && sales <= 10000) {
                sales *= 0.12;
            } else if (sales > 10000) {
                sales *= 0.145;
            }
        } else {
            sales = -1;
        }

        if (sales < 0){
            System.out.println("error");

        } else {
            System.out.printf("%.2f", sales);
        }
    }
}