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 C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
 
class Prog{
 
static void Main(){
  int n = int.Parse(Console.ReadLine());
  
  n = 180 * (n-2);
    
  Console.WriteLine("{0}", n);
  
}
 
}