Row Count Function MDX

Hi,

I'm need a row count function to use in my mdx code.

i have this 

 WITH

       MEMBER [Measures].[Row number] AS
                    iif( IsError(Axis(1).Count), null,
                           Rank (
                                  StrToTuple ("(" +
                                        Generate ( 
                                               Head ( Axis(0),
                                                      Axis(1).Item(0).Count
                                               ) AS RN,"Axis(1).Item(0).Item(" +
                                               CStr(RN.CurrentOrdinal - 1) +").Hierarchy.CurrentMember",","
                                        ) + ")"
                                  )                                              
                                  , Axis(1)
                           )
                    )

But when the row number is biggest than 500 it's dont work, staying in a loop.

some one know another form to do that?

thanks for the moment,

Bruno

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