import math

hours = int(input())
days = int(input())
workers = int(input())
hoursWork = (days - 0.10 * days) * 8;
extraTime = workers * (2 * days);
sumHours = math.floor(hoursWork + extraTime);
if sumHours >= hours:
	print(f'Yes!{sumHours-hours:.0f} hours left.')
else:
	print(f'Not enough time!{hours - sumHours:.0f} hours needed.')