Simply, to see the constant value you have to count from its upper 'setting', in this case '= 40'.
If you only have until 43-44, you see directly the constants, but when you have more than 6-7, it is not so easy. You have to count, and lose time every time.

Put in each and every number is NOT a good idea; it makes it very hard to maintain (if you want some order in the constants and not only add at the end every time).

What we could do is to mark every fifth constants.