Kvant Math Problem 1323

I need the full text of Kvant problem M1323 in order to produce a complete, rigorous solution.

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Problem

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

I need the full text of Kvant problem M1323 in order to produce a complete, rigorous solution. Could you provide the textual version of the problem statement?