# Sets and Subsets

Discrete Mathematics Level 3

Let $$A = \{1, 2, 3, \ldots, 2015\}$$, and $$B$$ be a subset of $$A$$, satisfying that any element of $$B$$ is a multiple or a divisor of any other element of $$B$$.

How many elements at most are there in $$B$$?

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