#!/user/bin/python3
def main()
	x=None
	y=None
	try:
		x=input("dose x:")
		y=input("dose y:")
		z=eval(x)+eval(y)
		print (f'x+y={z}')
	except Exception as e:
		print("Exception 1:",str(e))
#		exit (1)
	finally:
		print("go on")
if __name__=="__main__":
	main()