output_description: Print an integer representing the sum of the interior angles of a regular
  polygon with N sides.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      N
attempt: print(180 * (int(input()) - 1))
  
problem_description: 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.
samples: [{"input": "3", "output": "180\n    \n\nThe sum of the interior angles of a regular triangle is 180 degrees.\n\n* * *"}, {"input": "100", "output": "17640"}]