increment in xpath

Hey there!

Is it possible to build an increment in xsl like in Java?

Java example:
=========================
int k = 0;

for(int i = 0; i < 20; i++) {
    System.out.println("k is: "+k);
    k += 3;
}
=========================


I'm looking for something like that in XSL:
=========================
<xsl:varible name="k" select="0" />
<xsl:for-each select="myList">
    Increment: <xsl:value-of select="number($k)+3" />
</xsl:for-each>
=========================

Thanks for help!
Dariusz


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