How to create DetailData Summary

pele

I have Master/Detail report

MasterDataRow1
     DetailDataRow1
     DetailDataRow2
     DetailDataRow3
     DetailDataRow4
MasterDataRow2
     DetailDataRow1
     DetailDataRow2

And here I want to add Summary of DetailData
DetailDataRow1 - Count=2, Sum(DetailDataRow1)
DetailDataRow2 - Count=2, Sum(DetailDataRow2)
DetailDataRow3 - Count=1, Sum(DetailDataRow3)
DetailDataRow4 - Count=1, Sum(DetailDataRow4)

Is it possible to do it automatically? Now, I need to use many variables.