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