Referenciing several cells to yield one value or another

[Lorbiculous]

Probably simple but can't figure out how to do the formula:
I want a formula such that:
If ANY of the cells A1, A2, OR A3 have a value greater than or equal to 1, then I want the value of cell A1 displayed in cell D1. If none of these 3 cells' values are equal to/greater than 1, then I want a zero in cell D1. Do I use OR or IF for this? Thanks.

[oeldere]

d1=if(or(a1>=1,a2>=1,a3>=1),a1,"")

[martindwilson]

=if(countif(a1:a3,">=1"),a1,"")

[Lorbiculous]

Thank you very much! Your formula worked.( I only changed the last part so there is a zero between the quote marks instead of making D1 a blank cell-a minor change).

[Lorbiculous]

Thank you for your solution! It worked quite well. I appreciate getting such quick responses.