from operator import mul
from operator import add
from operator import floordiv
from operator import sub
from operator import truediv


def neutral(op):
	"""
	Returns neutral element of the given operation
	"""
	if op == mul: return 1
	if op == add: return 0
	if op == floordiv: return 1
	if op == sub: return 0
	if op == truediv: return 1