#include <iostream>

using namespace std;

class ListElement {
public:
  int value;
  ListElement *next;
};

int main() {
  ListElement *ptr, *head;
  int i;
  
  head = new ListElement;

  for(i=0, ptr = head; i < 4; i++, ptr = ptr->next) {
    ptr->value = i;
    ptr->next = new ListElement;
  }
  ptr->value = 4;
  ptr->next = NULL;

  for(ptr = head; ptr; ptr = ptr->next)
    cout<<ptr->value<<endl;
  
  return 0;
}