import calendar

Y = 2015
ans = 0
for i in range(12):
    M = i + 1
    _, lastday = calendar.monthrange(Y,M)
    for j in range(lastday):
        D = j + 1
        D_t = D//10
        D_o = D - D_t*10
        if M == D_t + D_o:
            ans = ans + 1

print(ans)