Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Cannot be Special Summoned. If you Tribute Summon this card, all Tributes must be WATER. This card gains 300 ATK for each face-up WATER monster you control, except this card.
--ジョーズマン
--Jawsman
local s,id=GetID()
function s.initial_effect(c)
	--cannot special summon
	local e1=Effect.CreateEffect(c)
	e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE+EFFECT_FLAG_UNCOPYABLE)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_SPSUMMON_CONDITION)
	c:RegisterEffect(e1)
	--tribute limit
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetCode(EFFECT_TRIBUTE_LIMIT)
	e2:SetValue(s.tlimit)
	c:RegisterEffect(e2)
	--atkup
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_SINGLE)
	e3:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e3:SetRange(LOCATION_MZONE)
	e3:SetCode(EFFECT_UPDATE_ATTACK)
	e3:SetValue(s.atkup)
	c:RegisterEffect(e3)
end
function s.tlimit(e,c)
	return not c:IsAttribute(ATTRIBUTE_WATER)
end
function s.atkfilter(c)
	return c:IsFaceup() and c:IsAttribute(ATTRIBUTE_WATER)
end
function s.atkup(e,c)
	return Duel.GetMatchingGroupCount(s.atkfilter,c:GetControler(),LOCATION_MZONE,0,c)*300
end