The game is $20-$40. You are in the big blind with

. An early player limps and another early player raises. Everyone folds to the small blind, who calls. You call. The early limper calls. There is $160 in the pot and four players. The flop comes:

, giving you bottom two pair. The small blind checks. You bet. Everyone calls. There is $240 in the pot. The turn is the

. The small blind checks. You bet and everyone calls. The pot is now $400. The river is the

. The small blind checks. What do you do?
ELON05