Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Gains 100 ATK for each monster your opponent controls.
--ジュラック・プロトプス
--Jurrac Protops
local s,id=GetID()
function s.initial_effect(c)
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCode(EFFECT_UPDATE_ATTACK)
	e1:SetValue(s.val)
	c:RegisterEffect(e1)
end
function s.val(e,c)
	return Duel.GetFieldGroupCount(c:GetControler(),0,LOCATION_MZONE)*100
end