Using Perl to calculate a value then set the value to a variable.

Hello, I previously used this code in an older version. I am trying to use this code currently in the Lighthouse-9 and it is not working

<input name="Calc_T1" id="Calc_T1" type="hidden" value ="

[% Begin Unverified Perl


   my $a = 0;
   my $sum1 = 0;
   for ($a = 2; $a <= 117; $a++)  {
	my $val1 = 0;
	my $elmnt1 = GETVALUE('Q4_r'. $a.'_c1');
	
		if ($elmnt1 != "")
		{
			$val1 = ($elmnt1);
		}
		
		if ($val1 > 0)
		 {	    
	  		$sum1 =($sum1) + ($val1);
	  				
		 }
 	 
}

return $sum1;

  End Unverified

%]  
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