3/6 rivered huge hand in tiny pot multiway

[Isura]

Minraiser is 77/7. I'm new to the table. River I'm not sure whether its better to raise to like 180/250 or shove. If you raise, call a shove from either player?

Party Poker No-Limit Hold'em, $ BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB ($600)
UTG ($450)
MP ($600)
CO ($1224.10)
Hero ($777)
SB ($955.05)

Preflop: Hero is Button with Q[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/spade.gif[/img]. MP posts a blind of $6. SB posts a blind of $3.
<font color="#666666">1 fold</font>, MP (poster) checks, CO calls $6, Hero calls $6, <font color="#666666">1 fold</font>, BB checks.

Flop: ($27) 5[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, MP checks, CO checks, Hero checks.

Turn: ($27) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, MP checks, CO checks, Hero checks.

River: ($27) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, <font color="#CC3333">MP bets $18</font>, <font color="#CC3333">CO raises to $36</font>, Hero ?