import java.util.LinkedList;
//import java.util.ListIterator;
/**
 *  We can't compile unless we import the right package(s)!
 *  Basic syntax of the iterator:
 *  ListIterator<E> listIterator = list.listIterator();
 */
public class ItCameFromOurLectureNotes
{
    public static void main() {
        LinkedList<Integer> lli = new LinkedList<Integer>();
        for (int i=0; i < 10; i++)
            lli.add(i);
            
        ListIterator<Integer> it = lli.listIterator();
        int acc = 0;
        while (it.hasNext()){
            int curVal = it.next();
            acc += curVal;
            it.set(acc);
        }
        System.out.println(itr.previous());
    }
}