d1 = list(range(1, 29))
d2 = list(range(1, 31))
d3 = list(range(1, 32))

ans = 0

for i in range(1, 13):
    if i == 2:
        for j in d1:
            if i == sum(divmod(j, 10)):
                ans += 1
    elif i == 4 or i == 6 or i == 9 or i == 11:
        for j in d2:
            if i == sum(divmod(j, 10)):
                ans += 1
    else:
        for j in d3:
            if i == sum(divmod(j, 10)):
                ans += 1

print(ans)