Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Increase your Life Points by 300 points for each monster on the field.
--ホーリー・エルフの祝福
--Gift of The Mystical Elf
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_RECOVER)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(0,TIMINGS_CHECK_MONSTER|TIMING_DRAW_PHASE)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetFieldGroupCount(tp,LOCATION_MZONE,LOCATION_MZONE)>0 end
	local rec=Duel.GetFieldGroupCount(tp,LOCATION_MZONE,LOCATION_MZONE)*300
	Duel.SetTargetPlayer(tp)
	Duel.SetTargetParam(rec)
	Duel.SetOperationInfo(0,CATEGORY_RECOVER,nil,0,tp,rec)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local p=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER)
	local rec=Duel.GetFieldGroupCount(tp,LOCATION_MZONE,LOCATION_MZONE)*300
	Duel.Recover(p,rec,REASON_EFFECT)
end