umnata Lili

import java.util.Scanner;

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

        int age = Integer.parseInt(scanner.nextLine());
        double priceOfWashingMachine = scanner.nextInt();
        int presentPrice = scanner.nextInt();

        int numberOfToys = 0;
        int savedMoney = 0;
        int moneyForBirthday = 10;

        for (int currentYear = 1; currentYear <= age; currentYear++){
            if (currentYear % 2 == 0) {
                savedMoney += (moneyForBirthday - 1);
                moneyForBirthday += 10;
            }else{
                numberOfToys++;
            }
        }
        System.out.println((savedMoney >= priceOfWashingMachine ?
                String.format("Yes! %.2f",(savedMoney - priceOfWashingMachine))
                : String.format("No! %.2f", (priceOfWashingMachine - savedMoney))));
    }
}
// 1 godini 2 cena na peralnq 3 edinichna cena na igrachka