How To End Function After Activated Once?

So this script lets a player place a table after they click the script.Parent but when you select it, you can place all the tables you want. How can I make it so that you only can place one table when you click the parent?

grid = 3
grid2 = 6
local Player = game.Players.LocalPlayer
local mouse = Player:GetMouse()

mouse.Button1Down:connect(function()
    local Spawn = game.Workspace.start
    local Pos =(Vector3.new((mouse.Hit.p.X+grid) - (mouse.Hit.p.X+grid)%grid2, (Spawn.Position.Y+0.5), (mouse.Hit.p.Z+grid) - (mouse.Hit.p.Z+grid)%grid2)) --tree stump
    local part = game.ReplicatedStorage.Table:Clone()
    part.Position = Pos
    part.Parent = game.Workspace
    print("Table Placed")
end)