





from __future__ import annotations

from math import pi

# Define the Reduced Planck Constant ℏ (H bar), speed of light C, value of
# Pi and the function
_lowerCamelCase			       =      1.054_571_817E-34  # unit of ℏ : J * s

_lowerCamelCase			       =      3E8  # unit of c : m * s^-1




def    __UpperCAmelCase(      lowercase_ ,    lowercase_ ,    lowercase_      ):

       if (force, area, distance).count(0      ) != 1:
              raise ValueError('''One and only one argument must be 0'''      )
       if force < 0:
              raise ValueError('''Magnitude of force can not be negative'''      )
       if distance < 0:
              raise ValueError('''Distance can not be negative'''      )
       if area < 0:
              raise ValueError('''Area can not be negative'''      )
       if force == 0:
              _lowerCamelCase							:     Union[str, Any]	=		(REDUCED_PLANCK_CONSTANT * SPEED_OF_LIGHT * pi**2 * area) / (
                  2_40 * (distance) ** 4
              )
              return {"force": force}
       elif area == 0:
              _lowerCamelCase							:     Any	=		(2_40 * force * (distance) ** 4) / (
                  REDUCED_PLANCK_CONSTANT * SPEED_OF_LIGHT * pi**2
              )
              return {"area": area}
       elif distance == 0:
              _lowerCamelCase							:     int	=		(
                  (REDUCED_PLANCK_CONSTANT * SPEED_OF_LIGHT * pi**2 * area) / (2_40 * force)
              ) ** (1 / 4)
              return {"distance": distance}
       raise ValueError('''One and only one argument must be 0'''      )


# Run doctest
if __name__ == "__main__":
       import doctest

       doctest.testmod()








def    __UpperCAmelCase(      lowercase_ = 10_00      ):
       _lowerCamelCase							:     Optional[int]	=		2**power
       _lowerCamelCase							:     Optional[int]	=		0
       while n:
              _lowerCamelCase,  _lowerCamelCase							:     Optional[Any]	=		r + n % 10, n // 10
       return r


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

