Subtotal Groups?

Hi all,

I have a spreadsheet where I'm grouping together checks deposited during a day, so say on 10/8/2013 we deposit 5 checks that are a sum of $5000, though I group them to hide all the breakdown and just show the $5000 sum. I have multiples lines like this and want to be able to total just those sums, though when I try to it is summing the summed number and all the detailed numbers. I initially thought of just dividing by 2, but some days we get only 1 check deposited, so in that case it is not doubled. Example of what I'm doing below. Thanks for any help!

- $5000 <- only visible cell when group is closed
.$1000
.$1000
.$1000
.$1000
.$1000

sum = $10000