#include <stdio.h>

namespace LinkedList {
  class ListNode {
  public:
    ListNode(int v): value(v), next(0) {}
    int value;
    ListNode *next;
  };
  class List {
  protected:
    ListNode *header;
  public:
    List();
  };
}

LinkedList::List::List() {
      header = new ListNode(6);
}