import java.util.Scanner;

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

        int age = Integer.parseInt(scanner.nextLine());
        double washingMachinePrice = Double.parseDouble(scanner.nextLine());
        int priceForToy = Integer.parseInt(scanner.nextLine());

        int countBrotherStealing = 0;
        double moneyEveryYear = 0;
        double toyMoney = 0;
        double savedMoney = 0;
        for (int i = 1; i <= age; i++) {

            if (i % 2 == 0) {
                moneyEveryYear += 10;
                countBrotherStealing++;
                savedMoney += moneyEveryYear;
            } else {
                toyMoney += priceForToy;
            }
        }
        savedMoney = savedMoney + toyMoney - countBrotherStealing;

        if (savedMoney > washingMachinePrice) {
            System.out.printf("Yes! %.2f", (savedMoney - washingMachinePrice));
        } else {
            System.out.printf("No! %.2f", (washingMachinePrice - savedMoney));
        }
    }
}