days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
happy_day = 0

for i in range(len(days)):
    for j in range(days[i]):
        if i + 1 == j // 10 + j % 10:
            happy_day += 1

print(happy_day)