Help getting the using player

[lua]function ENT:Use()

ply:SetHealth(ply:Health() + 20)

self.Entity:Remove()

end[/lua]

in this code how do i get the player that is using the entity

[lua]function ENT:Use( ent )

if ent:IsPlayer() then
	ent:SetHealth(ent:Health() + 20)
end

self.Entity:Remove()

end[/lua]

It worked Thankes