Easy fold. When deciding if we can setmine multi-way in a 3bet pot, look at the 3bettor's stats and stack. MP being in the hand might boost the pot, but it also doubles the chances that you lose with a set. It's highly unlikely you stack both, so focus on the one with the tighter range, ie SB who has squeezed. With just 3.50 eff stacks, it's a pretty easy fold.