Excel cell must be hidden and not calculated
 

Hi.
I have in cell A1 digit 1, in cell B1 digit 2, when i select A1 and B1 and
drag from right bottom corner of cell B1, i have 3 in cell C1, 4 in D1 and
etc.
Question is if, C1 is hided, i dont want that any digits were inserted there
when i am dragging cells to the right.
I beleive that you understand me.
Thanks for you help.

Peter