Kvant Math Problem 1420

Before I begin writing the solution, I need the text of Kvant problem M1420.

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Problem

The text version of the problem statement is currently being prepared. The graphical version can be viewed in the published issue.

Before I begin writing the solution, I need the text of Kvant problem M1420. Could you provide the full problem statement in text form so I can produce the rigorous solution following your instructions?