The answer is 8.
I know, that’s not what most of you were expecting. I did get some answers that were on the right track, but were not quite correct. At first glance, it looks like RHB, but if you separate out R into 1 and 2 (although it doesn’t look exactly like a 2), and separate out B into 1 and 3, then you end up with this:
H looks a bit like 1 – 1, and if you add that to what you already have, you will end up with:
which is 8.