Assuming Kaido and BM are dead, current top 10 highest known bounties:
1) Shanks - 4,048,900,000
2) Blackbeard - 3,996,000,000
3) Mihawk - 3,590,000,000
4) Buggy - 3,189,000,000
5) Luffy - 3,000,000,000
6) Law - 3,000,000,000
7) Kidd - 3,000,000,000
8) Crocodile - 1,965,000,000
9) Hancock - 1,659,000,000
10) Marco - 1,374,000,000 or King (if he's still alive) - 1,390,000,000
We need some 2 billions now.