(function( $ ) {
 
    "use strict";
     
    $(document).ready( function(){

    	$('.gfa_matrix_input').on('change keyup', function(){

    		var $total_qty = 0;
    		$('.gfa_matrix_input').each(function() {
    			var $this = $(this);
    			if($this.val() > 0){
    				$total_qty += parseInt($this.val());
    			}
    		});
    		$('.entry-summary .cart .quantity input.qty').val($total_qty); 
    	});

    } );
 
})(jQuery);