226 - Polygons

Polygons

Time Limit: 1 sec

**The Problem**

There is a **N **sided polygon. How many triangles you can form from that **N **sided triangle **?**

**The Input**

Input will be a number (2<N<1000) denoting the number of sides of the **polygon**.

**The Output**

The output will be the amount triangle that can be formed and should be printed in a separate line.

**Sample Input**

5

**Sample Output**

3

Problem Setter: Parag Paul