count=0
def wa(x):
	return sum(list(map(int,list(str(x)))))
for i in range(1,13):
	for j in range(1,32):
		if j==29 and i==2:
			break
		if j==31 and i in {2,4,6,9,11}:
			break
		if wa(j)==i:
			count+=1
print(count)