在ARENA的模型中，我有22个QUEUE，我想SUM他们的值并显示在我的动画中。问题是我的expression长度超过了256个字符的限制，因此我被卡住了。这是我想要的表达式：
NQ(TRAFFIC LIGHT AT N1.Queue) + NQ(TRAFFIC LIGHT AT N2.Queue) + NQ(TRAFFIC LIGHT AT N3.Queue) + NQ(TRAFFIC LIGHT AT N4.Queue) + NQ(TRAFFIC LIGHT AT N5.Queue) + NQ(TRAFFIC LIGHT AT N6.Queue) + NQ(TRAFFIC LIGHT AT N7.Queue) + NQ(TRAFFIC LIGHT AT N8.Queue) + NQ(TRAFFIC LIGHT AT N9.Queue) + NQ(TRAFFIC LIGHT AT N10.Queue) + NQ(TRAFFIC LIGHT AT N11.Queue) + NQ(TRAFFIC LIGHT AT N12.Queue) + NQ(TRAFFIC LIGHT AT N13.Queue) + NQ(TRAFFIC LIGHT AT N14.Queue) + NQ(TRAFFIC LIGHT AT N15.Queue) + NQ(TRAFFIC LIGHT AT N16.Queue) + NQ(TRAFFIC LIGHT AT N17.Queue) + NQ(TRAFFIC LIGHT AT N18.Queue) + NQ(TRAFFIC LIGHT AT N19.Queue) + NQ(TRAFFIC LIGHT AT N20.Queue) + NQ(TRAFFIC LIGHT AT N21.Queue) + NQ(TRAFFIC LIGHT AT N22.Queue)
知道如何在我的模型中执行此求和吗？