OHaganBooks.com has two main competitors: JungleBooks.com and FarmerBooks.com. At the beginning of August, OHaganBooks.com had $4,600$ customers. Of these, a total of $2,000$ customers were shared with JungleBooks.com, and $1,700$ were shared with FarmerBooks.com. Furthermore, $1,000$ customers were shared with both. JungleBooks.com has a total of $3,800$ customers, FarmerBooks.com has $3,800,$ and they share $1,300$ customers between them.

OHaganBooks.com is interested in merging with one of its two competitors. Which merger would give it the largest combined customer base.

JungleBooks.com

FarmerBooks.com

How large would the combined customer base be$?$