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 Go (1.6) (judge verdict: Accepted)

package main

import "fmt"

func main() {
  var n int
  fmt.Scan(&n)
  if n > 2 {
	  fmt.Println(180 * (n - 2))
  } else {
    fmt.Println(0)
  }
}