$("#limesurvey").on("change", function(event) {
var k = parseFloat($('input[id="answer752589X30X2319x2_y1"]').val());
var l = parseFloat($('input[id="answer752589X30X2319x3_y1"]').val());
var m = k+l;
$('input[id="answer752589X30X2319x1_y1"]').val(m);
});
</script>