Editorial for Another Contest 7 Problem 1 - Lonely Users

Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.
Submitting an official solution before solving the problem yourself is a bannable offence.

Note that the answer is always at least $N-1$ ~N-1~ due to the other $N-1$ ~N-1~ users.

When $N=2$ ~N=2~, Ren has one friend, and the answer is $N$ ~N~. Otherwise, the answer is $N-1$ ~N-1~.

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