import java.util.Scanner;

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

        int age = Integer.parseInt(scanner.nextLine());
        double priceW = Double.parseDouble(scanner.nextLine());
        int priceT = Integer.parseInt(scanner.nextLine());

        int money = 0;
        int toy = 0;
        int counter = 0;
        double total = 0;


        for (int year = 0; year < age; year++) {
            if (year % 2 == 0) {
                counter++;
                money = money + (10 * counter);
            } else {
                toy++;
            }
        }
        total = money + (priceT * toy) - counter * 1.0;
        if (total >= priceW) {
            System.out.printf("Yes! %.2f", total - priceW);
        } else {
            System.out.printf("No! %.2f", priceW - total);
        }
    }
}