Nested functions to use cell results to locate other cells.

I’m trying to use the result of a function to then highlight a cell and perform a fuction on the result of that cell.

=A(A17+22)/2
where I want to add 22 to the result of A17 (ex 259)
and then to get the result of A259 and ivide it by 2.

Any help?
Do I need to do this in a macro?
Thanks,
Tim