output_description: Print the answer.
  
  * * *
input_description: The input is given from Standard Input in the following format:
  
      
      
      N
attempt: #
  # abc055 a
  #
  import sys
  from io import StringIO
  import unittest
  
  
  class TestClass(unittest.TestCase):
      def assertIO(self, input, output):
          stdout, stdin = sys.stdout, sys.stdin
          sys.stdout, sys.stdin = StringIO(), StringIO(input)
          resolve()
          sys.stdout.seek(0)
          out = sys.stdout.read()[:-1]
          sys.stdout, sys.stdin = stdout, stdin
          self.assertEqual(out, output)
  
      def test_入力例_1(self):
          input = """20"""
          output = """15800"""
          self.assertIO(input, output)
  
      def test_入力例_2(self):
          input = """60"""
          output = """47200"""
          self.assertIO(input, output)
  
  
  def resolve():
      N = int(input())
  
      x = N * 800
      y = N // 15 * 200
      print(x - y)
  
  
  if __name__ == "__main__":
      # unittest.main()
      resolve()
  
problem_description: Statement
  
  Snuke has a favorite restaurant.
  
  The price of any meal served at the restaurant is 800 yen (the currency of
  Japan), and each time a customer orders 15 meals, the restaurant pays 200 yen
  back to the customer.
  
  So far, Snuke has ordered N meals at the restaurant. Let the amount of money
  Snuke has paid to the restaurant be x yen, and let the amount of money the
  restaurant has paid back to Snuke be y yen. Find x-y.
samples: [{"input": "20", "output": "15800\n    \n\nSo far, Snuke has paid 16000 yen, and the restaurant has paid back 200 yen.\nThus, the answer is 15800.\n\n* * *"}, {"input": "60", "output": "47200\n    \n\nSnuke has paid 48000 yen for 60 meals, and the restaurant has paid back 800\nyen."}]