Firm

import math
needed_hours = int(input())
days_for_work = int(input())
number_extra_workers = int(input())

hours_for_work = (days_for_work - (days_for_work * 0.1)) * 8
hours_for_extra_work = number_extra_workers * 2 * days_for_work
total_hours = hours_for_work + hours_for_extra_work
if total_hours >= needed_hours:
    remain_hours = total_hours - needed_hours
    print(f'Yes!{remain_hours:.0f} hours left.')
else:
    missing_hours = needed_hours - total_hours
    print(f'Not enough time!{math.ceil(missing_hours)} hours needed.')