Return cell next to cell if its not 0

In column A, I have numbers 1-400. In column B, I have my data.

I want to, in column C, return the value in column A for the first value in B that is greater than 0. How can I do this?

Try:

=INDEX(A:A,MATCH(1,INDEX(ISNUMBER(B:B)*(B:B>0),0),0))