



'''simple docstring'''
from __future__ import annotations

from typing import Any






def A__    (     UpperCAmelCase_							):
						if not postfix_notation:
												return 0

						_UpperCamelCase					:		Optional[Any] 				=   {'+', '-', '*', '/'}
						_UpperCamelCase					:		list[Any] 				=   []

						for token in postfix_notation:
												if token in operations:
																		_UpperCamelCase				,			_UpperCamelCase					:		int 				=   stack.pop(), stack.pop()
																		if token == "+":
																								stack.append(a + b							)
																		elif token == "-":
																								stack.append(a - b							)
																		elif token == "*":
																								stack.append(a * b							)
																		else:
																								if a * b < 0 and a % b != 0:
																														stack.append(a // b + 1							)
																								else:
																														stack.append(a // b							)
												else:
																		stack.append(int(UpperCAmelCase_							)							)

						return stack.pop()


if __name__ == "__main__":
					import doctest

					doctest.testmod()



from math import ceil
def       A	(    _lowercase = 1_001						):
						SCREAMING_SNAKE_CASE							:    Any							=							1

						for i in range(1		,  int(ceil(n / 2.0						)						)						):
												SCREAMING_SNAKE_CASE							:    Union[str, Any]							=							2 * i + 1
												SCREAMING_SNAKE_CASE							:    int							=							2 * i
												SCREAMING_SNAKE_CASE							:    List[str]							=							total + 4 * odd**2 - 6 * even

						return total


if __name__ == "__main__":
					import sys

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





