cnt = 0
for m in range(1, 13):
    for d1 in range(0, 10):
        d2 = m - d1
        if d2 < 0:
            continue
        day = 10 * d2 + d1
        if  m in {1, 3, 5, 7, 8, 10, 12} and day <= 31 or \
            m in {4, 6, 9, 11} and day <= 30 or \
            m == 2 and day <= 28:
            cnt += 1
print(cnt)