别人做的，我改了一下。实际上它可以将前4个数，通过4则运算组合,得到第5个数的值. 就是我们玩算24的游戏规则一样.-Someone else to do, and I changed a bit. In fact, it can be the first 4 numbers through four computing portfolio, get the value of the number of Article 5. Is that we play the rules of the ga