/*
  Lab exam 2/2/2005
  Solution Part 2
*/


public class UseApartment {

  public static double averageSizeFree(Apartment[] arc) {
    int count = 0;
    double sum = 0;
    for (int i = 0; i < arc.length; i++)
      if (arc[i].isFree()) {
        count++;
        sum = sum + arc[i].getSize();
      }

    if (count == 0)
      return 0;
    else
      return sum/count;
  }
}