Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card is used to Ritual Summon "Paladin of White Dragon". You must also Tribute monsters from your hand or field whose total Levels equal 4 or more.
--白竜降臨
--White Dragon Ritual
local s,id=GetID()
function s.initial_effect(c)
	Ritual.AddProcGreaterCode(c,4,nil,73398797)
end