[xsl] xslt:number numeration starts !=1

["ivanmacculi@xxxxxxxxx" <ivanmacculi@xxxxxxxxx>]

Hi all, i've this xslt to transform a xml to another that i've already posted. 
my problem is that i must modify it to have a numeration that starts from 7 and 
not from 1. So besides to have Carta 1r and follows, i will have Carta 7r and 
follows. I thought to "from" attribute of xslt:number, but it doesn't work. can 
you help me?

  
<xsl:stylesheet
   xmlns:xsl="http://www.w3.
org/1999/XSL/Transform"
   xmlns:mets="http://www.loc.gov/METS/";
   version="
2.0">

   <xsl:template match="@* | node()">
     <xsl:copy>
       <xsl:apply-
templates select="@*, node()"/>
     </xsl:copy>
   </xsl:template>

   <xsl:
template match="mets:div/@LABEL[matches(., '^Pagina [0-9]+$')]">
     <xsl:
variable name="n">
       <xsl:number level="any" count="mets:div[@LABEL[matches
(.,
'^Pagina [0-9]+$')]]"/>
     </xsl:variable>
     <xsl:attribute name="
LABEL" select="concat('Carta ', if ($n mod 2 =
0) then concat(($n + 1) idiv 2, 
'v') else concat(($n + 1) idiv 2, 'r'))"/>
   </xsl:template>

</xsl:
stylesheet>

XML:

<mets:div LABEL="Testo" ORDER="4" ORDERLABEL="1">
> <mets:
div LABEL="Frontespizio" ORDER="1" ORDERLABEL="1">
> <mets:div LABEL="Pagina 5" 
ORDER="1" ORDERLABEL="5">
> <mets:fptr FILEID="file.00008"/>
> </mets:div>
> 
</mets:div>
> <mets:div LABEL="Dedica" ORDER="2" ORDERLABEL="1">
> <mets:div 
LABEL="Pagina 6" ORDER="1" ORDERLABEL="6">
> <mets:fptr FILEID="file.00009"/>
> 
</mets:div>
> </mets:div>
> <mets:div LABEL="Canto I" ORDER="3" ORDERLABEL="1">

> <mets:div LABEL="Pagina 7" ORDER="1" ORDERLABEL="7">
> <mets:fptr FILEID="
file.00010"/>
> </mets:div>
> <mets:div LABEL="Pagina 8" ORDER="2" ORDERLABEL="
8">
> <mets:fptr FILEID="file.00011"/>
> </mets:div>
> <mets:div LABEL="Pagina 
9" ORDER="3" ORDERLABEL="9">
> <mets:fptr FILEID="file.00012"/>
> </mets:div>
> 
</mets:div>
> </mets:div>
>
OUTPUT XML

> <mets:div LABEL="Testo" ORDER="4" 
ORDERLABEL="1">
> <mets:div LABEL="Frontespizio" ORDER="1" ORDERLABEL="1">
> 
<mets:div LABEL="Carta 1r" ORDER="1" ORDERLABEL="5">
> <mets:fptr FILEID="file.
00008"/>
> </mets:div>
> </mets:div>
> <mets:div LABEL="Dedica" ORDER="2" 
ORDERLABEL="1">
> <mets:div LABEL="Carta 1v" ORDER="1" ORDERLABEL="6">
> <mets:
fptr FILEID="file.00009"/>
> </mets:div>
> </mets:div>
> <mets:div LABEL="Canto 
I" ORDER="3" ORDERLABEL="1">
> <mets:div LABEL="Carta 2r" ORDER="1" ORDERLABEL="
7">
> <mets:fptr FILEID="file.00010"/>
> </mets:div>
> <mets:div LABEL="Carta 
2v" ORDER="2" ORDERLABEL="8">
> <mets:fptr FILEID="file.00011"/>
> </mets:div>

> <mets:div LABEL="Carta 3r" ORDER="3" ORDERLABEL="9">
> <mets:fptr FILEID="
file.00012"/>
> </mets:div>
> </mets:div>
> </mets:div>