from datetime import date


def is_valid(ten: int, one: int) -> bool:
    num = ten + one
    if num < 1 or 12 < num:
        return False
    try:
        date(2015, num, ten * 10 + one)
        return True
    except Exception:
        return False


count: int = 0

for i in range(10):
    for j in range(10):
        if is_valid(i, j):
            count += 1

print(count)