Add Text Numbers

HTML

<ul>
    <li>MX11</li>
    <li>11</li>
    <li>11</li>
    <li>11</li>
</ul>

<p id="total"></p>

JavaScript

$(function () {

    function combineSomeShiz() {
        var value = 0;

        $('li').each(function () {
            var i =$(this).text();

            if (!isNaN(i)) {
                value = value + i;
            }

        });

        $('#total').text(value);
    }

    combineSomeShiz();

});