from datetime import date, timedelta

now = date(2015, 1, 1)
td = timedelta(days=1)
fin = date(2016, 1, 1)

ans = 0
while now < fin:
    m, d = now.month, now.day

    dd = str(d) + "0"
    ddd = int(dd[0]) + int(dd[1])

    if m == ddd:
        ans += 1

    now += td

print(ans)