Vtora

import java.util.Scanner;

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

        int guestCount = Integer.parseInt(sc.nextLine());
        double couvertPriceForOneMan= Double.parseDouble(sc.nextLine());
        double budget = Double.parseDouble(sc.nextLine());

        double discount = 0;
        double priceForCake = budget * 0.10;
        double sumForParty = 0;

        if(guestCount >= 10 && guestCount <= 15){
            discount = couvertPriceForOneMan * 0.15;
        }else if(guestCount > 15 && guestCount <= 20){
            discount = couvertPriceForOneMan * 0.20;
        }else{
            discount = couvertPriceForOneMan * 0.25;
        }

        couvertPriceForOneMan -= discount;

        sumForParty = guestCount * couvertPriceForOneMan + priceForCake;

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