[Nubotron]

Try something like this

pawn Код:

new players_in_checkpoint;
public OnPlayerEnterCheckpoint(playerid)
{
    GameTextForPlayer(playerid,"~R~You have reached the control centre",4000,3);
    SendClientMessageToAll(COLOR_RED,"One of the Attackers has Reached The Control Centre");
    GivePlayerMoney(playerid, 0);
    DisablePlayerCheckpoint(playerid);

    if (++players_in_checkpoint == 5)
        //there are 5 players in checkpoint, do your next action

     return 1;
}