sort "top" output and then save to file

[Genti Hila]

I am trying to save all the processes into a file by using top command:

top -cSb n 1 > proc.txt

It works fine but I want to sort it descending by the amount of memory each
proccess takes (descending).

I know how to do that interactively but how can i do when I run it as a
batch and save the output to a file.

I need to see some program that I think has some memory leaking problem.