day_month = [31, 28, 31, 30, 31, 30, 31, 31, 31, 31, 30, 31]
count = 0

for i in range(12):
    month = i + 1
    for j in range(day_month[i]):
        day = j + 1
        listed_day = list(str(day))
        sum_day = sum([int(cur) for cur in listed_day])
        
        if month == sum_day:
            count += 1
            
res = count

print(res)