What do I put where it says 'DO NOTHING so the loop will skip ws. X, Y & Z?

Thanks,
Howard

Option Explicit

Sub LoopThroughSheets()
Dim ws As Worksheet
If ws.Name = "X" Or ws.Name = "Y" Or ws.Name = "Z" Then
'DO NOTHING
Else
'Do some code stuff here like:
ws.Range("B1") = ws.Name
End If
End Sub