I want to count how many of a group of specific cells contain a number 0
where the range of cells is non-contiguous or non-bordering. ie. not (A1:A10)
Here is an example of what I am tyring, but it is not working correctly:

=COUNTA("R46,R73,R99,R125,R151,R177,R203","0")

The cell references in quotes are the 'range' and 0 is the value. All of
the cells in the range have formulas, but only 2 of them currently result in
a value 0, so the total should be 2. As the other formulas create values,
that number would go up.

I can't find any solid explanation of how to count to a cell range of
specific cells vs. a row, cloumn or table of cells. Any suggestions? thanks.