eom = [31,28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]


def is_valid_now(number: int) -> bool:
    ten = int(number/10)
    one = number % 10
    num = ten + one
    if num < 1 or 12 < num:
        return False
    current_eom = eom[num - 1]
    return number <= current_eom


def is_valid(month: int, day: int) -> bool:
    return month == int(day/10) + day % 10


count: int = 0

for i, dom in enumerate(eom):
    for j in range(dom):
        if is_valid(i + 1, j + 1):
            count += 1

print(count)