jquery nested selector

How can I grab the nested element "4"?

I tried:

var nights = $("div.nights h5 div.num").val();

and:

var nights = $("div.nights > h5 > div.num").val();

example:

<div class="nights">
        <h5 class="biguns">
            <div class="num">4</div>
            Nights
        </h5>
</div>