How do i make this script work? it involves IntValues

I need to make it so when the IntValue FedPower is Below 20 click detector disabled, but above 20 it re enables automatic?

Health = script.Parent.Parent.Parent.Health
Shield = script.Parent.Parent.Parent.Shield
FedPower = script.Parent.Parent.Parent.FedPower
Beam = script.Parent.Parent.VFDualBeam
Beam1 = script.Parent.Parent.VFDualBeam1
Sound = script.Parent.Parent.VFDualSound
Button = script.Parent.Parent.VFDualButton
Status = script.Parent.Parent.VFDualStatus
Effects = script.Parent.Parent.VFDualEffects
Effects1 = script.Parent.Parent.VFDualEffects1

function Damage()
	if (Shield.Value <=149) then
	Shield.Value = Shield.Value - 6.25
	Health.Value = Health.Value - 10
	elseif (Shield.Value >= 99) then
	Shield.Value = Shield.Value - 6.25
	Health.Value = Health.Value - 15
	elseif (Shield.Value >= 49) then
	Shield.Value = Shield.Value - 6.25
	Health.Value = Health.Value - 20
	elseif (Shield.Value >= 1) then
	Shield.Value = Shield.Value - 6.25
	Health.Value = Health.Value - 25
	end
end

function PowerFunction()
	if (FedPower.Value >=20) then
		Button.ClickDetector.MaxActivationDistance = 0
		if (FedPower.Value <=0) then
			Button.ClickDetector.MaxActivationDistance = 10
		end
	end
    
end

	function onClicked()
	Damage(onClicked)
	PowerFunction(onClicked)
	FedPower.Value = FedPower.Value - 20
	Beam.Transparency = 0.2
	Beam1.Transparency = 0.2
	Sound.Firing:Play() 
	Button.ClickDetector.MaxActivationDistance = 0
	Status.BrickColor = BrickColor.new(21)
	Effects.Fire.Enabled = true
	Effects1.Fire.Enabled = true
	Effects.PointLight.Enabled = true
	Effects1.PointLight.Enabled = true
	wait(1.2)
	Beam.Transparency = 1
	Beam1.Transparency = 1
	Effects.Fire.Enabled = false
	Effects1.Fire.Enabled = false
	Effects.PointLight.Enabled = false
	Effects1.PointLight.Enabled = false
	wait(4)
	Button.ClickDetector.MaxActivationDistance = 10
	Status.BrickColor = BrickColor.new(37)
	if (FedPower.Value <=0) then
		Button.ClickDetector.MaxActivationDistance = 10
	end
	end


script.Parent.ClickDetector.MouseClick:connect(onClicked)