Kvant Math Problem 358

I can produce a complete, rigorous Kvant-style solution, but I need the text of problem M358 to proceed.

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Problem

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

I can produce a complete, rigorous Kvant-style solution, but I need the text of problem M358 to proceed. Could you provide the problem statement?