class Counter:
  def __init__(self, val=0):
    self.reset_on = val
    self.val = val
  
  def __repr__(self):
    return f"Counter: {self.val} [reset on {self.reset_on}]"
  
  def incr(self):
    self.val += 1
    return self.val

  def decr(self):
    self.val -= 1
    return self.val

  def reset(self):
    self.val = self.reset_on
    return self.val