I have this formula calculating, but I need another cell added to the equation.

=ROUNDDOWN(AL170/Sheet1!B$3,0)*ROUNDDOWN(AM170/Sheet1!C$3,0)

I need to add AN170 and AO170 into the brackets

So in essence, it will be taking the totals of AN170 and AO170 combined then dividing it by Sheet1B$3,0

How do I make this happen?

Thanks!