Problem:
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.

Sample Input 1

3

Sample Output 1

180

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

Sample Input 2

100

Sample Output 2

17640

Solution in Python (3.4.3) (judge verdict: Accepted)

# from sys import exit
# A, B, C = [int(n) for n in input().split()]
N = int(input())
# a = [int(input()) for _ in range(N)]
# S = str(input())
# L = len(S)
# T = str(input())
# exit()
print((N-2)*180)