22: A3o in the SB -- get involved?

[IdiotVig]

I'm ashamed to admit I honestly don't know what to do here. But then I thought, what better place to allow the collective to bask in schadenfreude than 2+2?

Please, flame away, and tell me how trivially easy this is. BB got his stack from doubling up on a donk, and winning a couple of hands in the last orbit without showing down. Otherwise, no reads.

Party Poker No-Limit Hold'em Tourney, Big Blind is t300 (5 handed) converter

UTG (t950)
MP (t2240)
Button (t290)
Hero (t2025)
BB (t2495)

Preflop: Hero is SB with 3[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img].
3 folds, Hero ?