sum variables from templates

I am having a further problem with adding some different variables in
templates with include some numbers. The output should be the total sum of the
variables: total=1+0+4+1.
Is there a opportunity to sum this?
Many thanks
Markus


<root>

<xsl:template match="Question1">
  <xsl:variable1>1</xsl:variable1>
<xsl:template>
<xsl:template match="Question2">
  <xsl:variable2>0</xsl:variable2>
<xsl:template>
<xsl:template match="Question3">
  <xsl:variable3>4</xsl:variable3>
<xsl:template>
<xsl:template match="Question4">
  <xsl:variable4>1</xsl:variable4>
<xsl:template>
...
<xsl:template match="total">
  <xsl:value-of select="$total" />
<xsl:template>

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