def keta_sum(int_num):
    str_num = str(int_num)
    int_num_list = list(map(int, list(str_num)))
    sum_num = sum(int_num_list)
    return sum_num


days = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
ans = 0
for i in range(1, 13):
    for j in range(1, days[i] + 1):
        if i == keta_sum(j):
            ans += 1

print(ans)