repeated fields calculations

I am able to do calculations for the first fields, but the subsequent ones do not work. I wonder if anyone can point me to some direction.

my code:

jQuery (function ($) {
var $qty = $(‘.iqty’),
$total = $(‘#item-total’);

$qty.on(‘input’, function(e) {
var final_value = 1;
$qty.each(function() {
var value = $(this).val();
if (!isNaN(value) && value > 0) final_value += parseInt(value);
});
$ttl.val(final_value);
})
});`