




def lowerCamelCase__       (      _lowercase = 1000				) ->    int:

     '''simple docstring'''


     UpperCAmelCase_      :							List[Any]       =      1, 1
     UpperCAmelCase_      :							Tuple       =      2
     while True:
          UpperCAmelCase_      :							List[Any]       =      0
          UpperCAmelCase_      :							List[str]       =      fa + fa
          UpperCAmelCase_      :							int       =      fa, f
          index += 1
          for _ in str(_lowercase				):
               i += 1
          if i == n:
               break
     return index


if __name__ == "__main__":
     print(solution(int(str(input()).strip())))





from math import ceil







def lowerCamelCase__       (      _lowercase = 1001				):

     '''simple docstring'''


     UpperCAmelCase_      :							Optional[Any]       =      1

     for i in range(1			,						int(ceil(n / 2.0				)				)				):
          UpperCAmelCase_      :							List[Any]       =      2 * i + 1
          UpperCAmelCase_      :							Optional[int]       =      2 * i
          UpperCAmelCase_      :							Any       =      total + 4 * odd**2 - 6 * even

     return total


if __name__ == "__main__":
     import sys

     if len(sys.argv) == 1:
          print(solution())
     else:
          try:
               __a          =			int(sys.argv[1])
               print(solution(n))
          except ValueError:
               print('Invalid entry - please enter a number')