<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def add(self, crash):
 """ Adds a new crash to the container. @note: When the C{allowRepeatedKeys} parameter of the constructor is set to C{False}, duplicated crashes are ignored. @see: L{Crash.key} @type crash: L{Crash} @param crash: Crash object to add. """

        self.__keys.add( crash.signature )
        self.__count += 1