Haram = Bad Deed (sin)
The opposite of that is Good Deed, but actually
Halal = neutral (permitted)
I don't know the Arabic word for Good Deed.
So:
Haram = -1
Halal = 0
??? = 1
PS. English does not seem to have a single word that means "Good Deed" (like how Sin means "Bad Deed"). But I bet arabic does. Would be interesting to know which languages have words for the various levels. (Like a word for "permitted but discouraged", and other variations.)