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


def is_valid(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


count: int = 0

for i in range(31):
    if is_valid(i + 1):
        count += 1

print(count)