Score : $100$ points

Problem Statement

Given an integer $N$ not less than $3$, find the sum of the interior angles of a regular polygon with $N$ sides.

Print the answer in degrees, but do not print units.

Constraints

• $3 \leq N \leq 100$

Input

Input is given from Standard Input in the following format:

$N$

Output

Print an integer representing the sum of the interior angles of a regular polygon with $N$ sides.

3

180

The sum of the interior angles of a regular triangle is $180$ degrees.

100

17640