code: 
  
  
  from __future__ import annotations
  
  
  
  def   SCREAMING_SNAKE_CASE__						(							snake_case_	)			->							set[int]:
  				A__     :							Any   				={1}
  				A__     :							Optional[int]   				=[1]
  				for _ in range(2,	depth + 1	):
  								A__     :							str   				=[*previous_coefficients, 0]
  								A__     :							Optional[int]   				=[0, *previous_coefficients]
  								A__     :							List[Any]   				=[]
  								for x, y in zip(snake_case_,	snake_case_	):
  												coefficients.add(x + y	)
  												previous_coefficients.append(x + y	)
  				return coefficients
  
  
  
  def   SCREAMING_SNAKE_CASE__						(							snake_case_	)			->							set[int]:
  				A__     :							List[str]   				=set()
  				for number in unique_coefficients:
  								A__     :							List[str]   				=2
  								A__     :							Optional[Any]   				=number
  								while divisor**2 <= copy_number:
  												A__     :							str   				=0
  												while copy_number % divisor == 0:
  																copy_number //= divisor
  																multiplicity += 1
  												if multiplicity >= 2:
  																non_squarefrees.add(snake_case_	)
  																break
  												divisor += 1
  
  				return unique_coefficients.difference(snake_case_	)
  
  
  
  def   SCREAMING_SNAKE_CASE__						(							snake_case_ = 5_1	)			->							int:
  				A__     :							Tuple   				=get_pascal_triangle_unique_coefficients(snake_case_	)
  				A__     :							Optional[Any]   				=get_squarefrees(snake_case_	)
  				return sum(snake_case_	)
  
  
  if __name__ == "__main__":
  						print(F"{solution() = }")
  
  
  
  
style_context: 
  
  
  def   SCREAMING_SNAKE_CASE__						(							snake_case_	)			->							int:
  				barcode //= 1_0  # exclude the last digit
  				A__     :							List[str]   				=False
  				A__     :							Dict   				=0
  
  				# extract and check each digit
  				while barcode != 0:
  								A__     :							Union[str, Any]   				=1 if checker else 3
  								s += mult * (barcode % 1_0)
  								barcode //= 1_0
  								A__     :							Union[str, Any]   				=not checker
  
  				return (1_0 - (s % 1_0)) % 1_0
  
  
  
  def   SCREAMING_SNAKE_CASE__						(							snake_case_	)			->							bool:
  				return len(str(snake_case_	)	) == 1_3 and get_check_digit(snake_case_	) == barcode % 1_0
  
  
  
  def   SCREAMING_SNAKE_CASE__						(							snake_case_	)			->							int:
  				if str(snake_case_	).isalpha():
  								A__     :							Tuple   				=f'Barcode \'{barcode}\' has alphabetic characters.'
  								raise ValueError(snake_case_	)
  				elif int(snake_case_	) < 0:
  								raise ValueError('''The entered barcode has a negative value. Try again.'''	)
  				else:
  								return int(snake_case_	)
  
  
  if __name__ == "__main__":
  						import doctest
  
  						doctest.testmod()
  						__lowerCamelCase       :       List[Any]				   =			get_barcode(input("Barcode: ").strip())
  
  						if is_valid(barcode):
  												print(F"'{barcode}' is a valid barcode.")
  						else:
  												print(F"'{barcode}' is NOT a valid barcode.")
  
  
  
  