How many files can I store on my flash file system?

How many files can hold my flash file system? Or in other words, how many files can I create and store on my flash file system?

There are two different file systems we have to consider for this purpose:

INTFLASH of *.xx60 PLC systems: Maximum 2'500 files AND maximum 50 subdirectories consolidated. These directories can be created all on the same level or as subdirectories to each another.
All other flash file systems: Maximum 900 files and each created subdirectory consumes 16 files. There is no limit of the number of subdirectories on these flash file system.