ds

from math import floor

project_hours = int(input())
company_days = int(input())
employees = int(input())

employee_extra_hours = 2
employees_work_hours = 8

employee_work_days = company_days * 0.9
employee_working_hours = floor(employee_work_days * employees_work_hours)

extra_working_hours = (employees * employee_extra_hours) * company_days
time_to_finish_project = extra_working_hours + employee_working_hours

if time_to_finish_project >= project_hours:
    left_time = time_to_finish_project - project_hours
    print(f'Yes!{left_time} hours left.')

elif time_to_finish_project < project_hours:
    not_enough_time = project_hours - time_to_finish_project
    print(f'Not enough time!{not_enough_time} hours needed.')