"""simple docstring"""


from __future__ import annotations

from math import pi






def      __UpperCAmelCase       (      lowercase ,lowercase ,lowercase		):







  """simple docstring"""

  if (inductance, frequency, reactance).count(0		) != 1:
    raise ValueError("""One and only one argument must be 0"""		)
  if inductance < 0:
    raise ValueError("""Inductance cannot be negative"""		)
  if frequency < 0:
    raise ValueError("""Frequency cannot be negative"""		)
  if reactance < 0:
    raise ValueError("""Inductive reactance cannot be negative"""		)
  if inductance == 0:
    return {"inductance": reactance / (2 * pi * frequency)}
  elif frequency == 0:
    return {"frequency": reactance / (2 * pi * inductance)}
  elif reactance == 0:
    return {"reactance": 2 * pi * frequency * inductance}
  else:
    raise ValueError("""Exactly one argument must be 0"""		)


if __name__ == "__main__":
    import doctest

    doctest.testmod()

"""simple docstring"""


from collections.abc import Generator






def      __UpperCAmelCase       (      ):







  """simple docstring"""
  _UpperCAmelCase			,					_UpperCAmelCase    			=   0, 1
  while True:
    _UpperCAmelCase			,					_UpperCAmelCase    			=   b, a + b
    yield b






def      __UpperCAmelCase       (      lowercase = 10_00		):







  """simple docstring"""
  _UpperCAmelCase    			=   1
  _UpperCAmelCase    			=   fibonacci_generator()
  while len(str(next(lowercase		)		)		) < n:
    answer += 1
  return answer + 1


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