from __future__ import annotations

from typing import Any
def 					_snake_case	(  __snake_case						):
					if not postfix_notation:
										return 0

					_UpperCamelCase			     =     {'''+''', '''-''', '''*''', '''/'''}
					_UpperCamelCase			     =     []

					for token in postfix_notation:
										if token in operations:
															_UpperCamelCase     ,    _UpperCamelCase			     =     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(__snake_case						)						)

					return stack.pop()


if __name__ == "__main__":
					import doctest

					doctest.testmod()

def 					_snake_case	(  __snake_case = 100						):
					_UpperCamelCase			     =     (n * (n + 1) // 2) ** 2
					_UpperCamelCase			     =     n * (n + 1) * (2 * n + 1) // 6
					return sum_cubes - sum_squares


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