Help? How would I say a number of players in a server

I'm trying to create a script that will tell how many players are in the server like

if --What ever would show how many players are in the game Lets use game.players.numplayers = 2 do
--Bla bla here is the game script
else 
game.startergui.screengui.textlabel = "1 player is in your server game wont be starting until somone else joins
end

I know I wrote that wronge but what is the way to tell how many players are in a server