$5$ points are given in the plane, any three non-collinear and any four non-concyclic. If three points determine a circle that has one of the remaining points inside it and the other one outside it, then the circle is said to be [i]good[/i]. Let the number of good circles be $n$; find all possible values of $n$.
1. **Understanding the problem**: We are given 5 points in the plane, no three of which are collinear and no four of which are concyclic. We need to determine the number of "good" circles, where a circle is defined as good if it passes through three of the points, has one of the remaining two points inside it, and the other outside it.

2. **Generalizing the problem**: The problem can be generalized to a set \( S \) of \( 2k+1 \) points in the plane, with no three collinear and no four concyclic. A circle is called a halving circle if it passes through three points of \( S \) and has exactly \( k-1 \) points of \( S \) inside it and \( k-1 \) points outside it.

3. **Applying the general result**: According to the reference provided (F. Ardila, The number of halving circles, A.M.M. 2004, p.586-591), the number of halving circles for a set of \( 2k+1 \) points is \( k^2 \).

4. **Specific case for \( k = 2 \)**: In our problem, we have 5 points, so \( 2k+1 = 5 \) implies \( k = 2 \). Therefore, the number of halving circles (or good circles) is given by \( k^2 \).

\[
k^2 = 2^2 = 4
\]

5. **Conclusion**: The number of good circles for the given set of 5 points is 4.

The final answer is \(\boxed{4}\).