Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
The ATK of this card becomes equal to the combined original ATK of the 2 monsters you Tributed for the Tribute Summon of this card.
--合成魔獣 ガーゼット
--Maju Garzett
local s,id=GetID()
function s.initial_effect(c)
	--tribute check
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_MATERIAL_CHECK)
	e1:SetValue(s.valcheck)
	c:RegisterEffect(e1)
	--give atk effect only when  summon
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetCode(EFFECT_SUMMON_COST)
	e2:SetOperation(s.facechk)
	e2:SetLabelObject(e1)
	c:RegisterEffect(e2)
end
function s.valcheck(e,c)
	local g=c:GetMaterial()
	local tc=g:GetFirst()
	local atk=0
	for tc in aux.Next(g) do
		local catk=tc:GetTextAttack()
		atk=atk+(catk>=0 and catk or 0)
	end
	if e:GetLabel()==1 then
		e:SetLabel(0)
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_SET_ATTACK)
		e1:SetValue(atk)
		e1:SetReset(RESET_EVENT|RESET_DISABLE|RESET_TURN_SET|RESET_TOGRAVE|RESET_REMOVE|RESET_TEMP_REMOVE|RESET_TOHAND|RESET_TODECK|RESET_LEAVE)
		c:RegisterEffect(e1)
	end
end
function s.facechk(e,tp,eg,ep,ev,re,r,rp)
	e:GetLabelObject():SetLabel(1)
end