How to use forloop.counter using key and value in django template language

Question

I have a for loop in template. But it has key and value so when I try to use {{forloop.counter0}} it counts by twos. I guess it consider keys and values while counting

My code is this:

{% for key,value in LANGUAGES %}
{% if key != LANGUAGE_CODE %} <!-- LANGUAGE_CODE = {{LANGUAGE_CODE}} -->
<li id="{{ key }}"  class="nav-item lang-elements">
    <a class="nav-link" index="{% if key %}{{ forloop.counter0 }}{% endif %}" href="#{{ key }}">{{ value |title }}</a>
</li>
{% endif %}
{% endfor %}

But returns:

0 en English

2 es Spanish

But I need this result:

0 en English

1 es Spanish