



'''simple docstring'''



from math import factorial



def   _A       (   _lowerCAmelCase = 20					):



							"""simple docstring"""



							__lowercase       	=2 * n  # middle entry of odd rows starting at row 3 is the solution for n = 1,
							# 2, 3,...
							__lowercase       	=n // 2

							return int(factorial(_lowerCAmelCase					) / (factorial(_lowerCAmelCase					) * factorial(n - k					))					)


if __name__ == "__main__":
		import sys

		if len(sys.argv) == 1:
				print(solution(20))
		else:
				try:
						lowerCamelCase	 =       int(sys.argv[1])
						print(solution(n))
				except ValueError:
						print("""Invalid entry - please enter a number.""")








'''simple docstring'''



def   _A       (   _lowerCAmelCase					):



							"""simple docstring"""



							if not isinstance(_lowerCAmelCase  ,   _lowerCAmelCase					):
														raise TypeError('only integers accepted as input'					)
							else:
														__lowercase       	=str(abs(_lowerCAmelCase					)					)
														__lowercase       	=[list(_lowerCAmelCase					) for char in range(len(_lowerCAmelCase					)					)]
														for index in range(len(_lowerCAmelCase					)					):
																					num_transpositions[index].pop(_lowerCAmelCase					)
														return max(
														    int(''.join(list(_lowerCAmelCase					)					)					) for transposition in num_transpositions					)


if __name__ == "__main__":
		__import__("""doctest""").testmod()



