how sum values on crystal report?

hi,
i want sum same values on my report for example
for display like this

page 1
hi1 = 100
hi2 = 150
hi3 = 300
hi1 = 100
hi2 = 150
hi3 = 300
hi1 = 100
total of page=1200

page2 & final page
hi2 = 150
hi3 = 300
hi1 = 100
hi2 = 150
hi3 = 300
total of all = 2200

i have tryed this:
sum({total.count})

but i have the total of values in first page the solution is using this line
if PageNumber<>TotalPageCount then
but even using this i get the total of values on first page :mad:
how can i do that?
anyone?
thanks a lot for your help:)