1. How many men are in the faithful party?

From the text:

Alexander Smollett, master; David Livesey, ship's doctor; Abraham Gray, carpenter's mate; John Trelawney, owner; John Hunter and Richard Joyce, owner's servants, landsmen--being all that is left faithful of the ship's company--with stores for ten days at short rations, came ashore this day and flew British colours on the log-house in Treasure Island.

Six men are named, the servants and landsmen are not numbered.

Note, the Captain is unaware that Jim is still alive.