That there are some entities (maybe ordered, maybe related to numbers three, five and seven in some way) and there are some values associated with those entities, two of which (accidentally or not) need to be initially set to corresponding number, but the third one possibly not, but better look around in the comments or code to understand and make sure the code is correct.

Then maybe leave a comment right after `= 1;` why this variable shouldn't be initialized with 3 that would clear up confusion for you if it was there.