Hermit, please wait until tomorrow. Don't post the answer.
I agree with Uranium that 3 bits should control the information. What's the deal with what to add or multiply? I want to try it out in the morning.
That is, I know that I need to look it up in the wiki to solve this. But I absolutely don't remember this algorithm from memory.
Added 32 seconds ago
No, it's not clear which one it is. But it's clear that the error is among the first 5 bits, and it definitely exists.
Added 9 minutes ago
That is, I know that I need to look it up in the wiki to solve this. But I absolutely don't remember this algorithm from memory.