Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card is used to Ritual Summon "Fortress Whale". You must also Tribute monsters from your hand or field whose total Levels equal 7 or more.
--要塞クジラの誓い
--Fortress Whale's Oath
local s,id=GetID()
function s.initial_effect(c)
	Ritual.AddProcGreaterCode(c,7,nil,62337487)
end