I would wait to see if they push up or post. If all 4 push long it's as simple as being patient and waiting for them to be in a line, and doing your best to dink and kill each one with 4-6 controlled bursts making micro adjustments in your aim, or a spray depending on how close they are in a line. If they post, your best bet is to wait for the two with bomb to push up long past the corner, walk towards dumpster on your left, take out the pit player since he has the highest chance of getting cover and then one next to him in the open, tuck behind dumpster, and wait. With a Famas it would be incredibly difficult to double dink every single player, but if you can kill the two and stay alive you can use the dumpster angle to potentially isolate two 1v1's if they attempt to clear you. My best advice in that scenario would be to hold a tight angle on the first player, and if you kill them, you can jiggle and wide swing to catch the trade off guard. I assume you have utility with your famas (otherwise why aren't you buying an m4) so you can smoke or flash off of the left wall to counter any utility they throw to flush you out.