Untitled

import java.util.Scanner;

public class Exercise4 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int age = Integer.parseInt(scanner.nextLine());
        double washingMachine = Double.parseDouble(scanner.nextLine());
        int toyPrice = Integer.parseInt(scanner.nextLine());
        int birthdayMoney = 0;
        int toys = 0;

        for (int i = 1; i <= age; i++) {
            if (i % 2 > 0) {
                toys++;
            } else {
                birthdayMoney+= i * 5 - 1;
            }
        }

        int totalMoney = toys * toyPrice + birthdayMoney;
        double result = Math.abs(totalMoney - washingMachine);

        if (totalMoney >= washingMachine) {
            System.out.printf("Yes! %.2f", result);
        } else {
            System.out.printf("No! %.2f", result);
        }



    }
}