Kvant Math Problem 443

Before I begin writing the complete solution, I need the **full textual statement of Kvant problem M443**.

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Solve time: 5m56s
Source on kvant.digital

Problem

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

Before I begin writing the complete solution, I need the full textual statement of Kvant problem M443. The graphical version alone is not enough for a rigorous solution, since I cannot infer all details from images. Could you provide the text of the problem?