EV estimate for preflop descision

[Fabian]

Let's say you are playing in a typical 10-handed game of 3/6 on partypoker. You have the button and all 7 in front of you limp. For discussion purposes assume you know the small blind will complete and the big blind will check.

You look at your cards and see A-2s. How much do you think you are giving up, EV-wise, by folding instead of limping, if you're giving up anything at all?

Thanks.