count = 0
month_list = [int(i) for i in range(1, 13)]
day_list = [str(j) for j in range(1, 32)]
for i in month_list:
    for j in day_list:
        n = 0
        for k in range(len(j)):
            n += int(j[k])
        if i == n:
            count += 1
print(count)