<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def notify(self, value):
 """ Increment or decrement the value, according to the given value's sign The value should be an integer, an attempt to cast it to integer will be made """

        value = int(value)

        with self.lock:
            self.value += value