import calendar

c = 0
for m in range(1, 13):
    d = calendar.monthrange(2015, m)[1]

    for j in range(1, d + 1):
        j = str(j)

        if len(j) == 1:
            if str(m) == j:
                c += 1
        else:
            if int(j[0]) + int(j[1]) == m:
                c += 1
print(c)