output_description: Print the answer.
  
  * * *
input_description: The input is given from Standard Input in the following format:
  
      
      
      N
attempt: n = int(input())
  
  k = n//15
  
  cost = n*800
  
  return = k*200
  
  print(cost - return)
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."}]