Thank you, Den! Cool nickname, it gives me a feeling of déjà-vu...

Thanks. I've updated the kata description. Is it clear now?

Could you, please, approve this kata?

Oh, sorry, I've missed the crux

Did you mean harder than 5 kyu?

Thanks for your translation, I've approved it.

.deleted

Thanks for your translation.

Ok, thanks

Well, when I was working on this kata, I thought of it as a simple recursion task. There're lots of 4 kyu kata that have similar ideas in their solutions (for example, this one: https://www.codewars.com/kata/52ec24228a515e620b0005ef).

But if something has changed since then, let my kata be 5 kyu. I want it to be an uncomplicated recursion.

Ok, I've replaced the 10^18 constraint with a 10^36 one. Is that enough?