class Expense:

    def __init__(self,paidBils):
        self.income=70000
        self.paidBills=paidBils
        self.spent=self.income-self.paidBills
        self.remains=self.income-self.spent


class Bill(Expense):
    amountPaid=0
    def __init__(self):
        pass
    def Electric(self,isPaid):
        if (isPaid):
            self.amountPaid+=1000
            Expense.__init__(self,self.amountPaid)
    def Water(self,isPaid):
         if (isPaid):
            self.amountPaid+=3000
            Expense.__init__(self,self.amountPaid)
    def Telivision(self,isPaid):
         if (isPaid):
            self.amountPaid+=600
            Expense.__init__(self,self.amountPaid)
    def SpentExpense(self):
        print(self.spent)
    def RExpense(self):
        print(self.remains)


A=Bill()

A.Electric(True)
A.Water(True)
A.RExpense()
A.spent