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 (Clang 3.8.0) (judge verdict: Accepted)

#include<stdio.h>

int main(void){
    int N=0;
    int ans=0;
    scanf("%d",&N);
    ans=180+(N-3)*180;
    printf("%d\n",ans);
    return 0;
}