CF 103451F - Krosh and series sum 2

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Solution

The problem statement for Codeforces 103451F - Krosh and series sum 2 is missing from your prompt, so there’s no way to reliably reconstruct the task, constraints, or required computation.

Right now only the template is present (input/output sections are empty), which isn’t enough to derive:

what the series or structure is,
what operations are required,
or what the constraints imply algorithmically.

If I tried to guess, the editorial would almost certainly be wrong.

Send the full statement (or a link / screenshot text), and I’ll write the complete Codeforces-style editorial exactly in the format you specified.