check and print nodes in xslt

Partial XML

<Notes>
<Note>Line 1</Note>
<Note>Line 2</Note>
<Note>Line 2</Note>
</Notes>

Partial XSLT

<xsl:for-each select="/Notes/Note">
<xsl:value-of select=".">
</xsl:value-of>
</xsl:for-each>

Output:

Line 1
Line 2
Line 3

I want to be able to print only the first two lines. Or a message stating "No Notes". But, I don't understand how to count exactly two or check for a lack of any elements.