def sumDigits(x):
    return sum(map(int, str(x)))

def check(m, d):
    return sumDigits(m) == sumDigits(d)

cnt = 0
for m in range(1, 12 + 1):
    dd = 31
    if m == 2:
        dd = 28
    elif m in [4,8,9,11]:
        dd = 30
    for d in range(1, dd + 1):
        cnt += check(m, d)

print(cnt)