days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
cnt = 0
for i in range(12):
    for j in range(1, days[i] + 1):
        if i + 1 == sum(map(int, str(j))):
            cnt += 1
print(cnt)