





def      lowerCamelCase__      (__lowerCamelCase						):
     assert (
         isinstance(A__,							A__						) and number_of_steps > 0
     ), f"""number_of_steps needs to be positive integer, your input {number_of_steps}"""
     if number_of_steps == 1:
          return 1
     _SCREAMING_SNAKE_CASE     ,      _SCREAMING_SNAKE_CASE							:						List[Any]         =				1, 1
     for _ in range(number_of_steps - 1						):
          _SCREAMING_SNAKE_CASE     ,      _SCREAMING_SNAKE_CASE							:						Any         =				current + previous, current
     return current


if __name__ == "__main__":
       import doctest

       doctest.testmod()

'''simple docstring'''
from math import log

from scipy.constants import Boltzmann, physical_constants

lowercase__											=3_00  # TEMPERATURE (unit = K)






def      UpperCamelCase_				(      A__  ,      A__  ,      A__  ,      ):

	if donor_conc <= 0:
		raise ValueError("""Donor concentration should be positive"""						)
	elif acceptor_conc <= 0:
		raise ValueError("""Acceptor concentration should be positive"""						)
	elif intrinsic_conc <= 0:
		raise ValueError("""Intrinsic concentration should be positive"""						)
	elif donor_conc <= intrinsic_conc:
		raise ValueError(
		    """Donor concentration should be greater than intrinsic concentration"""						)
	elif acceptor_conc <= intrinsic_conc:
		raise ValueError(
		    """Acceptor concentration should be greater than intrinsic concentration"""						)
	else:
		return (
		    Boltzmann
		    * T
		    * log((donor_conc * acceptor_conc) / intrinsic_conc**2						)
		    / physical_constants["electron volt"][0]
		)


if __name__ == "__main__":
		import doctest

		doctest.testmod()
