一个数如果恰好等于它的所有真因子之和，这个数就称为“完数”。

例如，6的真因子为1，2，3，而6=1+2+3，因此，6是“完数”。求1000以内的所有完数之和。答案：530

-A number exactly equal to it' s all true factor and this number is called the " finished number. For example, the true factor as 1,2,3, and 6 = 1+2+3, therefore, 6 is " End Number" . Find the number and all finished within 1000. Answer: 530