CleverLilly

import java.util.Scanner;

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

        int lillyAge = Integer.parseInt(scanner.nextLine());
        double washingMachine = Double.parseDouble(scanner.nextLine());
        int toyPrice = Integer.parseInt(scanner.nextLine());
        int evenYears = 0;
        int oddYears = 0;
        int moneyEvenYears = 0;

        // odd years -> toy
        // even years -> money 10lv for first and 10lv more for every next
        //Lilly brother cheat with 1 lv for each money year
        // lilly sll toys for for numberOfToys * toyPrice
        // if enough left = total - washing machine price
        // if not enough = washing machine - total

        for (int years = 1; years <= lillyAge; years++) {

            if (years % 2 == 0) {
                evenYears++;
                moneyEvenYears = (evenYears * 10) + moneyEvenYears;

            } else {
                oddYears++;
            }
            // deduct 1 lv for each even year, brother cheat
        }
        int netMoney = moneyEvenYears - evenYears;
        int moneyFromToys = oddYears * toyPrice;
        int totalSaved = netMoney + moneyFromToys;

        if ( totalSaved> washingMachine){
            double left = totalSaved - washingMachine;
            System.out.printf("Yes! %.2f", left);
        } else {
            double need = washingMachine - totalSaved;
            System.out.printf("No! %.2f", need);
        }
    }
}