day1 = list(range(1, 32))
day2 = list(range(1, 31))
day3 = list(range(1, 29))

l = 0
for i in range(1, 13):
    if i in [1, 3, 5, 7, 8, 10, 12]:
        days = day1
    elif i in [4, 6, 9, 11]:
        days = day2
    else:
        days = day3

    for s in days: 
        s_formatted = f"{s:02}"
        A = int(s_formatted) // 10
        B = int(s_formatted) % 10
        if A + B == i:
            l = l + 1
        
    
print(l)