import datetime
aDate = datetime.date(2015, 1, 1)
b = 0
while aDate !=  datetime.date(2015,12,31):
	
	digits = [int(c) for c in str(aDate.day)]
	if aDate.month == sum(digits):
		b = b + 1
	aDate = aDate + datetime.timedelta(days=1)
print b