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 PyPy3 (7.3.0) (judge verdict: Accepted)

#!/usr/bin/env python3
import sys
def input():
    return sys.stdin.readline()[:-1]

def main():
    N = int(input())

    print(180*(N - 2))

if __name__ == '__main__':
    main()