import java.util.*;

class Tax {
    int calculate(int amount) {
        return (int)(amount * 0.10); // 10% base tax
    }
}

class SpecialTax extends Tax {
    int calculate(int amount, boolean bypass) {
        int base = super.calculate(amount);
        if (bypass) return base;
        return base + (int)(amount * 0.05); // +5% surcharge
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int amount = sc.nextInt();
        String flag = sc.next();
        if(amount<0){
        System.out.println("Invalid input");
        return 0;
        }
        boolean bypass = flag.equalsIgnoreCase("yes");

        SpecialTax tax = new SpecialTax();
        System.out.println(tax.calculate(amount, bypass));
    }
}