Clever Lily [Mimi][PB]

import java.util.Scanner;

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

        int savings = 0;
        int toyCount = 0;
        int brotherShare = 0;

        for (int year = 1; year <= age; year++) {
            if (year % 2 == 0) { // money
                savings += year *10 / 2;
                brotherShare++;
            } else { // toy
                toyCount++;
            }
        }

        // add toys money to savings:
        savings += toyCount * toyPrice;

        // -1 lv. for brother:
        savings -= brotherShare;

        double diff = savings - washPrice;
        if (diff >= 0) {
            System.out.printf("Yes! %.2f",(diff));
        } else {
            System.out.printf("No! %.2f", Math.abs(diff));
        }
    }
}