[Python] Modulus % in Django template

I'm looking for a way to use something like the modulus operator in django. What I am trying to do is to add a classname to every fourth element in a loop.

With modulus it would look like this:

{% for p in posts %}
<div class="post width1 height2 column {% if forloop.counter0 % 4 == 0 %}first{% endif %}}">
<div class="preview">

</div>
<div class="overlay">

</div>
<h2>p.title</h2>
</div>
{% endfor %}


Of course this doesn't work because % is a reserved character. Is there any other way to do this?

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