days = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
happy_days = 0
for month in range(1, 13):
    day = days[month]
    for d in range(1, day + 1):
        if month == (int(d / 10) + d % 10):
            happy_days += 1
print(happy_days)