Dear Friends, you may find that we have another problem submitted by our kind colleague Vladimir:

Every Leaf on Every Tree

I vaguely feel it is somewhere between childish arithmetics and advanced number theory, but not sure yet :) Curious to try myself!

Hopefully Vladimir can review and verify the task - there was minor change in code due to math function lacking in outdated python (3.5) used by server. Also there was small clarification marked "important" in the text which I decided to drop (hoping it becomes clear from description above and leaving careless people a chance to figure it out anyway from supposed mismatch with example) - but please do tell if you would like this to be returned :)

Sorry for delay with publishing it - it seems Vladimir properly send "notification to admin" in the forum post mentioning it but due to duscussion continuation I failed to realize it immediately when quickly looking at the topic. But this is a good hint - I think that optional "note" should be included to this notification functionality.

Thanks, Rodion!

Since two of our colleagues have already solved it (at this writing), I'm certain your Python3.5 compatibility fix is correct.

I am also fine with your edit; that was the last-minute addition that was somewhat redundant.

I like the problems that, in one insight, take the solver from "Whuh?" to "Wow." Hopefully, this one works like that as well.

I'll post my own solution in about a week.