output_description: Print `YES` if this grid remains the same when rotated 180 degrees; print `NO`
  otherwise.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      C_{11}C_{12}C_{13}
      C_{21}C_{22}C_{23}
attempt: """ small multiple """
  
  K = int(input())
  
  
  def get_sum_each_digits(number):
      """
      get sum.
      """
      chars = list(str(number))
      int_map = map(int, chars)
      result = sum(int_map)
      # print("number:{0}, result:{1}".format(number, result))
      return result
  
  
  def main():
      """
      main function.
      """
  
      min = K
      multiple = 0
      while multiple < 100000:
          multiple += 1
          temp = get_sum_each_digits(K * multiple)
          if temp < min:
              min = temp
          if min == 1:
              break
  
      # print("ans ---")
      print(min)
  
  
  main()
  
problem_description: Statement
  
  You are given a grid with 2 rows and 3 columns of squares. The color of the
  square at the i-th row and j-th column is represented by the character C_{ij}.
  
  Write a program that prints `YES` if this grid remains the same when rotated
  180 degrees, and prints `NO` otherwise.
samples: [{"input": "pot\n    top", "output": "YES\n    \n\nThis grid remains the same when rotated 180 degrees.\n\n* * *"}, {"input": "tab\n    bet", "output": "NO\n    \n\nThis grid does not remain the same when rotated 180 degrees.\n\n* * *"}, {"input": "eye\n    eel", "output": "NO"}]