How do I make this teleport script work if destination is within 50 studs?

Okay all I need to know is I want the player to teleport anywhere but it has to be less than a specific distance, lets say 50 studs how would I add that to my script? What would I use? script ----

p = game.Players.LocalPlayer
c = p.Character
mouse = p:GetMouse()
k = false
dist = 50

function Main()
	if k == false and p:WaitForChild("Data").doingMove.Value == false then
		k = true
		local pos = mouse.Hit.p
		p:WaitForChild("Data").doingMove.Value = true
		c.Torso.CFrame = CFrame.new(Vector3.new(pos.x, pos.y+3, pos.z))
		wait(.5)
		p:WaitForChild("Data").doingMove.Value = false
		wait(2)
		k = false
		end
end


script.Parent.Activated:connect(Main)