




def 							__SCREAMING_SNAKE_CASE						(    snake_case_		):

						'''simple docstring'''


						if not isinstance(snake_case_			,					snake_case_		):
												_UpperCAmelCase									=  f"""Input value of [number={number}] must be an integer"""
												raise TypeError(snake_case_		)
						if number < 1:
												raise ValueError("Input must be a positive integer"		)
						return number * (2 * number - 1)


if __name__ == "__main__":
				import doctest

				doctest.testmod()










def 							__SCREAMING_SNAKE_CASE						(    snake_case_ = 99_8001		):

						'''simple docstring'''


						for number in range(n - 1			,					9999			,					-1		):
												_UpperCAmelCase									=  str(snake_case_		)

												# checks whether 'str_number' is a palindrome.
												if str_number == str_number[::-1]:
																		_UpperCAmelCase									=  999

																		# if 'number' is a product of two 3-digit numbers
																		# then number is the answer otherwise fetch next number.
																		while divisor != 99:
																								if (number % divisor == 0) and (len(str(number // divisor		)		) == 3.0):
																														return number
																								divisor -= 1
						raise ValueError("That number is larger than our acceptable range."		)


if __name__ == "__main__":
				print(f"""{solution() = }""")




