public class Account {
    private int balance;

    public Account()
    {
	balance = 100;
    }

    public Account(int initialBalance)
    {
	balance = initialBalance;
    }

    public int withdraw(int amount)
    {
	if (amount <= balance)
	    balance = balance - amount;
	return balance;
    }
    
    public int deposit(int amount)
    {
	balance = balance + amount;
	return balance;
    }
}

public class Speaker {
    public void say(String stuff)
    {
	System.out.println(stuff);
    }
}

public class Lecturer extends Speaker {
    public void lecture(String stuff)
    {
	this.say(stuff);
	this.say("abstraction abstraction abstraction");
    }
}

public class ArrogantLecturer extends Lecturer {
    public void say(String stuff)
    {
	super.say("it is obvious that " + stuff);
    }
}