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OMIOPOLYGON - TUHIN The Mathematician


Tuhin Chowdhury is a great Mathematician. He likes to play with polygon. One day he decides to calculate the angles of a polygon. He starts with a triangle, draw 5 triangles where every triangle’s angles or side lengths are distinct.  He calculates total angles of that triangle and  notices that the total angles of every triangle are 180 degree. To make a interesting formula he tries again with square, draws 5 square and get interesting things again, he finds 360 degree angle in every square. He thinks that it is a chance to be famous in the world by making a great formula. For this reason he draws polygon with 5, 6,7 ………….n side and calculates angle. Your task to help Tuhin to calculate the angles for creating the formula.

Input:

The first line contain 1 integer N (3<=N<=1000000000) number of side of a polygon.

Output :

 Print a single integer – total angle of polygon.

Examples:

         

Input:

3

Output:

180

Input:

5

Output:

540


Added by:Ruhul
Date:2019-08-03
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:C NCSHARP C++ 4.3.2 CPP CPP14 C99 JULIA PYPY3 PYTHON3