Server ram help?

Okay, i plan on buying 4 different servers from https://shockbyte.com/minecraft/
what i am here to ask though is that how much ram i will need?
This is what i'll have:
I am getting 1 gold plan and one iron plan. The gold for Hardcore factions and the other for Op Kit pvp.
then i am getting 2 dirt packages (one for proxy which is what a support said i needed for it to work properly) and one for the hub server.
Of course this will all be connected with bungeecord.

So how much ram will i need? i plan to have around 30 plugins on the Gold plan and maybe around 20 to 25 on the iron, and if possible i plan to have 80 players on/slots on both (iron and gold) servers and i am setting the dirt server to 80 also for the fallback but it will only have around at most 5 plugins.
I will only have 1 world for each server besides the factions one.

 

Locked, bungeecord forces servers to be in offline mode which isn't supported here.