I have read (and re-read) the series of articles about the MAX function, and I almost have it working. But the following gives me a total across the 3 countries, rather than the maximum of any of the 3. What am I doing wrong?

[customer].[country].[High Sales] AS
'Max([customer].[Country].members ,
[unit sales] )'
{ ([unit sales],[customer].[Country].children ) ,
([unit sales],[customer].[country].[High Sales]) }
on columns ,
non empty [Product].[Product family].children ON rows
FROM [warehouse and sales]

It must be in my numeric expression, the 2nd argument of the MAX function.