How do I count the number of players in a server

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Hi everyone !
I am searching for hours ! I would like to know how many players I have in a server so I can limit the server' start a game when there are enough players and so on.
How can I do that ?

If not possible, how can I create a gameobject that belongs to a server and to this server I will pass some int++ as player Instantiating in to it.

Thanks !

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