Total Internal Angles of a Polygon

Given a polygon with n sides, determine the total sum of its internal angles in degrees.

The formula for calculating the sum of the internal angles is given by:

$$\text{sum}=(n-2)\times180$$

Note: The number of sides n will always satisfy n ≥ 3.

inputFormat

The input consists of a single line containing one integer n (n ≥ 3) - the number of sides of the polygon.

outputFormat

Output a single integer which is the total sum of the internal angles of the polygon in degrees.

3

180