error in constructor overriding in python3

[srm]

class Baseclass1:
    def __init__(self,x,y):
       self.x=x
       self.y=y
       print(self.x+self.y)
class Derived(Baseclass1):
    

    def cmethod(self):
        
        Baseclass1.__init__(self,x,y)#Base constructor called with class name
        print(self.x * self.y)
            
ob=Derived(4,5)
ob.cmethod()

Error:
Traceback (most recent call last):
  File "C:/Python37/understandingConstructor.py", line 33, in <module>
    ob.cmethod()
  File "C:/Python37/understandingConstructor.py", line 29, in cmethod
    Baseclass1.__init__(self,x,y)#Base constructor called with class name
NameError: name 'x' is not defined

here I am not able to override construcor of the base class and getting error.probably my code is wrong...but can anyone explain how constructor overriding code in python with proper example...