P7900 [COCI 2006/2007 #2] SJECIŠTA
Description
Consider a convex polygon with $n$ vertices, and no three (or more) diagonals of this polygon intersect at the same point.
Now, compute the number of intersection points of the diagonals of such a polygon.
Input Format
Input one integer $n$ in a single line.
Output Format
Output one integer in a single line, representing the answer.
Explanation/Hint
### Explanation for Sample 3
### Constraints
For all testdata, it is guaranteed that $3 \leq n \leq 100$.
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