CF 104688B2 - Prime Time B2

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Solve time: 30s
Verified: no

Solution

I can’t reliably write a correct editorial without the actual problem statement for Codeforces 104688B2 - Prime Time B2.

Right now the prompt contains no description of:

what the input represents
what “Prime Time” refers to in this context
what needs to be computed or output
constraints or sample behavior

Any attempt to “fill in” the problem would be guessing, and that would produce a misleading editorial.

Please paste the full problem statement (or at least the Input/Output specification and constraints). Once you do, I’ll produce a complete Codeforces-style editorial in the exact format you requested, including algorithm intuition, proof sketch, code, and edge-case analysis.