import decimal




def 				_snake_case     (       ):
		"""simple docstring"""







		SCREAMING_SNAKE_CASE_  :		str    				=   0
		SCREAMING_SNAKE_CASE_  :		List[str]    				=   decimal.Context(prec=1_0_5     )
		for i in range(2       ,			1_0_0     ):
				SCREAMING_SNAKE_CASE_  :		List[str]    				=   decimal.Decimal(SCREAMING_SNAKE_CASE__     )
				SCREAMING_SNAKE_CASE_  :		int    				=   number.sqrt(SCREAMING_SNAKE_CASE__     )
				if len(str(SCREAMING_SNAKE_CASE__     )     ) > 1:
						answer += int(str(SCREAMING_SNAKE_CASE__     )[0]     )
						SCREAMING_SNAKE_CASE_  :		Union[str, Any]    				=   str(SCREAMING_SNAKE_CASE__     )[2:1_0_1]
						answer += sum(int(SCREAMING_SNAKE_CASE__     ) for x in sqrt_number_str     )
		return answer


if __name__ == "__main__":
		import doctest

		doctest.testmod()
		print(f'''{solution() = }''')

from __future__ import annotations

import sys




def 				_snake_case     (       lowerCAmelCase							:       int     ):
		"""simple docstring"""







		if n < 0:
				raise ValueError("Negative arguments are not supported"     )
		return _fib(lowerCAmelCase     )[0]




def 				_snake_case     (       lowerCAmelCase							:       int     ):
		"""simple docstring"""







		if n == 0:  # (F(0), F(1))
				return (0, 1)

		# F(2n) = F(n)[2F(n+1) − F(n)]
		# F(2n+1) = F(n+1)^2+F(n)^2
		SCREAMING_SNAKE_CASE_				,   SCREAMING_SNAKE_CASE_  :		Dict    				=   _fib(n // 2     )
		SCREAMING_SNAKE_CASE_  :		Optional[Any]    				=   a * (b * 2 - a)
		SCREAMING_SNAKE_CASE_  :		List[str]    				=   a * a + b * b
		return (d, c + d) if n % 2 else (c, d)


if __name__ == "__main__":
		__lowerCamelCase :     str          =  int(sys.argv[1])
		print(f'''fibonacci({n}) is {fibonacci(n)}''')
