Show that set of natural numbers with zero ordered by division is complete lattice.

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I have to prove thatthe set of non-negative numbers ordered by division in complete lattice by showing that every non-empty subset of non-negative numbers has infimum.
I know that infimum of finite set is given by greatest common divisor, but how to prove it? In {1,2,3} infimum is 1, but what is infimum in {2,3,4}?