A very rough idea would be that its quite far from the 500 gates,if my memory does not serve me wrong theese gates are to your left as you enter airside,the ticket ofice is at the oposite side of the international terminal on the departure level.

BTW : If you want this info for a future trip,you should know that the flights depart from different gates,and often from bus gates,there is no system to which flights gets which gates.