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 == 1 and 3 and 5 and 7 and 8 and 10 and 12) :
        for s in day1:
            s = f"{s:02}"
            A = int(s)//10
            B = int(s)%10
            if A+B == i:
                l = l+1
    elif(i == 4 and 6 and 9 and 11):
        for s in day2:
            s = f"{s:02}"
            A = int(s)//10
            B = int(s)%10
            if A+B == i:
                l = l+1
    else:
        for s in day3:
            s = f"{s:02}"
            A = int(s)//10
            B = int(s)%10
            if A+B == i:
                l = l+1
print(l)