How can I print in log the number of tests running as part of one group in TestNG?

I need to print this before actual execution of tests start. Anyways, we get the count at last of execution.

Say for example if my testng.xml looks like:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://ift.tt/19x2mI9" >

<suite name="Suite1">
   <test name="test1">

   <groups>
      <run>
      <include name="functest" />
      </run>
   </groups>

   <classes>
      <class name="GroupTestExample" />
   </classes>

   </test>
</suite>

And there are 10 methods in class GroupTestExample which comes under group functest, it should print 10 in log as soon as it starts running.