Easter Party

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int guests = Integer.parseInt(scanner.nextLine());
        double envelope = Double.parseDouble(scanner.nextLine()),
                budget = Double.parseDouble(scanner.nextLine()),
                sum = guests * envelope;

        if (guests >= 10 && guests <= 15) {
            sum *= 0.85;
        } else if (guests > 15 && guests <= 20) {
            sum *= 0.80;
        } else if (guests > 20) {
            sum *= 0.75;
        }

        sum += budget / 10;

        if (budget >= sum) {
            System.out.printf("It is party time! %.2f leva left.\n", budget - sum);
        } else {
            System.out.printf("No party! %.2f leva needed.\n", sum - budget);
        }
    }
}