OK,nothing fancy here,but for some reason this wont work,I have a column A of appx 67 movies I want to buy,next column B I have a # 1 if I own it,and a # 0,if I dont,now below column b I have the simple formula =SUM(B91-(B1:B90)) B91 being the total # of movies I want which is 67, and of course adding B1:b90 equals # movies I already got..........once I type in the formula and hit enter it doesnt give me a total it gives a #VALUE! line,so I changed B91 to the number 67, =SUM(67-(B1:B90)) , and got the same #VALUE! total,I know Im going to feel stupid once I here what Im doing wrong but for some reason I cant get it right,what am I doing wrong

Thanks
Steve