class BankAccount():
	def __init__(self, initial_balance=0):
		self.balance = initial_balance
	def deposit(self, amount):
		self.balance += amount
	def withdraw(self, amount):
		self.balance -= amount
	def overdrawn(self):
		return self.balance < 0

my_account = BankAccount(15)
my_account.withdraw(5)
print my_account.balance