如何在Xcode 5中初始化全局NSMutableArray

I am trying to initialize a global NSMutableArray that I can add integers to later. I just need to know how and where I should initialize my array so that it can be accessed and changed by any function that I use later in my program. Also I am using Xcode 5 and know that the array needs to be 180 in length.I am trying to initialize a global NSMutableArr