class Calculator:
	@staticmethod
	def add(x,y):
		return x+y
	@staticmethod
	def subtract(x,y):
		return x-y
	@staticmethod
	def multiply(x,y):
		return x*y
	@staticmethod
	def divide(x,y):
		return x/y
	# Write methods to add(), subtract(), multiply() and divide()
	