class Driver {
  public static void main(String[] args) {
    IntList a = IntList.NIL;
    IntList b = a.cons(2);
    IntList c = b.cons(1);
    IntList d = IntList.make(1,2,3,50);
    IntList e = d.cons(13);
    int x = a.length() + b.length() + c.length() + d.length();
    a.print();
    b.print();
    c.print();
    d.print();
    e.print();
    System.out.println(x);
  }
}