SmartLily

import java.util.Scanner;

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

        int age = Integer.parseInt(scan.nextLine());
        double washingMachinePrice = Double.parseDouble(scan.nextLine());
        int toyPrice = Integer.parseInt(scan.nextLine());

        double money = 0;
        int toysCount = 0;
        int moneyGift = 0;

        for (int i = 1; i <= age; i++) {

            if(i % 2 == 0){
                moneyGift += 10;
                money += moneyGift - 1;
            }
            else{
                toysCount++;
            }
        }

        money += toysCount * toyPrice;

        double reminder = Math.abs(money - washingMachinePrice);

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