Addition of 2 classes

[Naito]

hello
i want too add class A with class B but this problem occurs
(i want to experiment with the code so that's why i made 2 classes)

Error:
TypeError: unsupported operand type(s) for +: 'int' and 'Chair'

class Table:
    def __init__(self, x):
        self.x = x
        self.y = Chair(self)

    def __add__(self, other):
        self.x + self.y


class Chair:
    def __init__(self, y):
        self.y = y


taw = Table(1)
kor = Chair(20)
print(taw + kor)

im still kinda new with Object-Oriented Programming
thank you