import java.util.ArrayList;
import java.util.List;

public class DEPT {

    private long   id;
    private String name;
    private List   depts = new ArrayList();
    private List   users = new ArrayList();

    public User find(long id) {
        User tmpUser = null;
        DEPT tmpDept = null;
        for(int i=0;i<users.size();i++)
        {
            tmpUser = (User)users.get(i);
            if(tmpUser.id == id)
                return tmpUser;
        }
        for(int i=0;i<depts.size();i++)
        {
            tmpDept = (DEPT)depts.get(i);
            tmpUser = tmpDept.find(id);
            if(tmpUser != null)
                return tmpUser;
        }
        return null;
    }
}

class User {
    public long   id;
    private String name;
    public DEPT    parent;
}