Finding the Paging File Size

The following expression returns the paging file size in Megabytes:

Q: sum of (preceding texts of firsts " " of following texts of firsts ".sys " of 
preceding texts of firsts "%00" of following texts of substrings "%00" of ("%00" 
& value "PagingFiles" of key "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control
\Session Manager\Memory Management" of registry as string) as integer)
A: 1536