We’re given a list of at least three numbers named <code>sides</code>. Each entry in <code>sides</code> represents the length of a side of a triangle.

Write a function <code>possible_triangles</code> to determine the number of possible triangles that can be formed using the given side lengths.

In the case that more than three side lengths are given, there may be several possible triangles.

Note: If there are multiple equal side lengths in the list, we consider them as distinct sides.

Examples:

Input:

<pre tabindex="0" class="chroma"><code>#Example 1:
sides = [3, 3, 3]
def possible_triangles(sides) -&gt; 1

#Example 2:
sides = [3, 3, 3, 3]
def possible_triangles(sides) -&gt; 4

#Example 3:
sides = [1, 2, 3.5]
def possible_triangles(sides) -&gt; 0
</code></pre>

Find the number of possible triangles from a list of side lengths.

Possible Triangles

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