Finding Service Accounts on a Windows server

Hello,

Im trying to find the service accts that are not localsystem, NT AUTHORITY\LocalService  or NT AUTHORITY\NetworkService

Here is what I have so far.

Clear-Host

get-content

c:\temp\servers.txt |ForEach-Object {$_

I can remove the one of the built-in logon accounts from the list. But I'm not having much luck buidling the "IF" statement using and\or .