完全数,指其除其本身外所有因数之积等于其本身的正整数。给你一个数n,问你n是不是完全数。
第一行仅一个数 n(0<=n<=107) n (0<=n<=10^7) n(0<=n<=107)
如果n是完全数,输出Yes,否则输出No
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