[RESOLVED] Constructor

Assume the existence of a Phone class with a constructor that accepts two parameters: a string for the phone number followed by a boolean representing whether the phone provides added-value services. Assume a derived class MP3Phone has been defined that has two data members: an integer, memorySize, for the size, in megabytes of the phone memory, and a boolean, playsAAC, representing whether the phone is capable of playing AAC-encoded audio files. Write a constructor for MP3Phone that accepts three parameters: a string for the phone number (which is passed up to the Phone constructor, together with the value true for the added-value boolean), and an integer followed by a boolean for the data members of the MP3Phone class..

im lost....can anyone help me last problem left i cant figure it out