win-win 
adjective
Of or denoting a situation in which each party benefits in some way: we are aiming for a win-win situation...
- What you've always got to come up with is a win-win situation where both of you get as much of what you want as you possibly can.
- In other words they have managed to engineer a win-win situation for themselves, at the expense of their bitter rivals to the north of the island.
- But on the plus side, I'm pretty scared of flying, so if I don't go, it's still a win-win situation.