import java.util.Scanner;

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

        String city = scanner.nextLine();
        double sales = Double.parseDouble(scanner.nextLine());
        double commission = 0;

        if ("Sofia".equals(city)){
            if (sales >=0 && sales<=500) {
                commission = sales * 0.05;
                System.out.printf("%.2f",commission);
            } else if (sales >500 && sales <= 1000){
                commission = sales * 0.07;
                System.out.printf("%.2f",commission);
            } else if (1000 < sales && sales <= 10000){
                commission = sales * 0.08;
                System.out.printf("%.2f",commission);
            } else if (sales > 10000) {
                commission = sales * 0.12;
                System.out.printf("%.2f",commission);
            } else {
                System.out.println("error");
            }
        } else if ("Varna".equals(city)){
            if (sales >=0 && sales<=500) {
                commission = sales * 0.045;
                System.out.printf("%.2f",commission);
            } else if (sales >500 && sales <= 1000){
                commission = sales * 0.075;
                System.out.printf("%.2f",commission);
            } else if (1000 < sales && sales <= 10000){
                commission = sales * 0.1;
                System.out.printf("%.2f",commission);
            } else if (sales > 10000) {
                commission = sales * 0.13;
                System.out.printf("%.2f",commission);
            } else {
                System.out.println("error");
            }
        }else if ("Plovdiv".equals(city)) {
            if (sales >= 0 && sales <= 500) {
                commission = sales * 0.055;
                System.out.printf("%.2f", commission);
            } else if (sales > 500 && sales <= 1000) {
                commission = sales * 0.08;
                System.out.printf("%.2f", commission);
            } else if (1000 < sales && sales <= 10000) {
                commission = sales * 0.12;
                System.out.printf("%.2f", commission);
            } else if (sales > 10000) {
                commission = sales * 0.145;
                System.out.printf("%.2f", commission);
            } else {
                System.out.println("error");
            }
        }else {
            System.out.println("error");
        }
    }
}