


from math import ceil




def      UpperCAmelCase__ (lowerCAmelCase_ = 1001     ):




					'''simple docstring'''


					__SCREAMING_SNAKE_CASE		     =       1

					for i in range(1						,		int(ceil(n / 2.0     )     )     ):
										__SCREAMING_SNAKE_CASE		     =       2 * i + 1
										__SCREAMING_SNAKE_CASE		     =       2 * i
										__SCREAMING_SNAKE_CASE		     =       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''')




"""simple docstring"""







from math import asin, atan, cos, radians, sin, sqrt, tan

a__       :							List[str]        =  6_37_81_37.0
a__       :							Tuple        =  6_35_67_52.31_42_45
a__       :							str        =  6_3_7_8_1_3_7




def      UpperCAmelCase__ (lowerCAmelCase_						,		lowerCAmelCase_						,		lowerCAmelCase_						,		lowerCAmelCase_     ):




					'''simple docstring'''


					__SCREAMING_SNAKE_CASE		     =       (AXIS_A - AXIS_B) / AXIS_A
					__SCREAMING_SNAKE_CASE		     =       atan((1 - flattening) * tan(radians(lowerCAmelCase_     )     )     )
					__SCREAMING_SNAKE_CASE		     =       atan((1 - flattening) * tan(radians(lowerCAmelCase_     )     )     )
					__SCREAMING_SNAKE_CASE		     =       radians(lowerCAmelCase_     )
					__SCREAMING_SNAKE_CASE		     =       radians(lowerCAmelCase_     )
					# Equation
					__SCREAMING_SNAKE_CASE		     =       sin((phi_a - phi_a) / 2     )
					__SCREAMING_SNAKE_CASE		     =       sin((lambda_a - lambda_a) / 2     )
					# Square both values
					sin_sq_phi *= sin_sq_phi
					sin_sq_lambda *= sin_sq_lambda
					__SCREAMING_SNAKE_CASE		     =       sqrt(sin_sq_phi + (cos(lowerCAmelCase_     ) * cos(lowerCAmelCase_     ) * sin_sq_lambda)     )
					return 2 * RADIUS * asin(lowerCAmelCase_     )


if __name__ == "__main__":
		import doctest

		doctest.testmod()
