HELP MACRO USING RINGS

[Navinter]

Hello i need a script that every time i loot a ring of healing my char use it but when there are 3+ hydras use energy ring, then he use keep using ring of healing if i still have one of that rings.

i tried this macros to the energy ring.
1000 {Energy Ring ON} 200 {E ring} Creatures.ByName(Hydra)>=3 Self.Equip.Ring(3051)
1000 {Energy Ring OFF} 200 {E ringOFF} Creatures.ByName(Hydra)<3 Self.UnEquip.Ring(0)

thanks in advance i tried many ways to do what i've explained but without succes, only one death XD.