I need help with following math application:

I have two rows of values. Values in row 2 will change according to the
changes in row 1. The change pattern is: average of those values in row 2
*3+3 when the values in row 1 =0.

I tried the formula: =IF(COUNTIF(A1:Z1,0),AVERAGE(A2:Z2)*3+3,1). It did not
work. Please help.

Thank you,
Linda