Alternatively, you may take the east stairs (a second immediate left after entering at the main entrance), or the west stairs at the other end of the building (accessible from the west entrance, facing Keen, the physics building). The central stairs, which you face if you enter Carothers from the central entrance off the parking lot that Carothers shares with the Love building, do not go all the way up to the fourth floor. If you use that central entrance, take the steps down to the first floor. Then turn right, and take the elevator (which will be on your right) to the fourth floor. Upon exiting the elevator, turn right and proceed as above.
I am usually in the office on Tuesdays and on Thursdays.