Excel formula need formula for if value in A1>0 we need A1, but if value in A1 is 0, then we need the lowest value of A2 and A3

Question

       A
1     5000
2     10000
3     12000
4     

I need a formula for if value in A1>0 we need A1, but if value in A1 is 0, then we need the lowest value of A2 and A3.

Answer 1

Simple, really:

=IF(A1>0,A1,MIN(A2:A3))

If A1 > 0, show A1, otherwise show the minimum value of A2 and A3

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See C1 (using A*) and D2 (using B*):