#!/usr/bin/env python3

class A:
	def __init__(self):
		self.n = 2
		
	def add(self, m):
		print('self is {0} @A.add'.format(self))
		print('A', self.n)
		print('A', m)
		self.n += m
		
		
class B(A):
	def __init__(self):
		self.n = 3
		
	def add(self, m):
		print('self is {0} @B.add'.format(self))
		super().add(m)
		print('B', self.n)
		print('B', m)
		self.n += 3
		
class C(A):
	def __init__(self):
		self.n = 4
		
	def add(self, m):
		print('self is {0} @C.add'.format(self))
		super().add(m)
		print('C', self.n)
		print('C', m)
		self.n += 4
		
		
class D(B, C):
	def __init__(self):
		self.n = 5
		
	def add(self, m):
		print('self is {0} @D.add'.format(self))
		super().add(m)
		print('D', self.n)
		print('D', m)
		self.n += 5
		
d = D()
d.add(2)

print('done', d.n)