<amp-script layout="container" script="hello-world">
<div class="row">
    <form id="filtri" class="col-12" method="post">
............
    </form>
</div>
</amp-script>
<script id="hello-world" type="text/plain" target="amp-script">
    jQuery("input[name=\'summa2\']").click(function() {
        jQuery("input[name=\'summa\']").val( jQuery(this).val() );
        jQuery(\'#summa\').html( jQuery(this).val()+\' €\' );
        update();
    })
...............................................
</script>