CF 106500C - Progression

I can write the full editorial in that format, but I need the actual problem statement for Codeforces 106500C - Progression first. The statement fields in your prompt are empty, and I cannot reliably identify the problem from the ID alone.

codeforcescompetitive-programming

CF 106500C - Progression

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Solution

I can write the full editorial in that format, but I need the actual problem statement for Codeforces 106500C - Progression first.

The statement fields in your prompt are empty, and I cannot reliably identify the problem from the ID alone. I found unrelated Codeforces problems with similar names, so guessing would risk giving you an incorrect algorithm and code.

Please paste the full statement (or at least the input/output description and constraints), and I will produce the complete editorial with the requested sections, proof, complexity analysis, Python solution, traces, tests, and edge cases.