from __future__ import annotations

from typing import Any






def     lowerCAmelCase_			(   _SCREAMING_SNAKE_CASE     :				list			):
						if not postfix_notation:
												return 0

						UpperCamelCase_		:							Optional[Any]  =		{"""+""", """-""", """*""", """/"""}
						UpperCamelCase_		:							List[Any]  =		[]

						for token in postfix_notation:
												if token in operations:
																		UpperCamelCase_,UpperCamelCase_		:							Optional[Any]  =		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(_SCREAMING_SNAKE_CASE			)			)

						return stack.pop()


if __name__ == "__main__":
	import doctest

	doctest.testmod()








"""simple docstring"""




from math import ceil



def     __magic_name__		(					UpperCamelCase     :		int = 1001     )     ->						int:
    a__		=			1

    for i in range(1							,		int(ceil(n / 2.0     )     )     ):
        a__		=			2 * i + 1
        a__		=			2 * i
        a__		=			total + 4 * odd**2 - 6 * even

    return total


if __name__ == "__main__":
    import sys

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


