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)