copy files to sharepoint doc library

I have about 600 documents that are stored in folders on a network share. I need to copy all of the files to a sharepoint site and the folder names have to become the metadata for the document. Can this be done using Powershell? I never used powershell for something like this so I'm kind of stuck on this.

Current Structure:

jan -- (Folder)

      Sales Summary - (folder) 

                     salessummary.doc -- (file name)


so when the file gets uploaded to sharepoint, Jan and Sales Summary need to be metadata for the salessummary.doc file