/* What's wrong with this program? */


using namespace std;  //required by new C++ standard
#include<iostream>

class list
{
  public:
  int head;
  list *tail;
  list(int h, list *t) {head=h; tail=t;}
};

// This function is supposed to return the last integer in a linked list
int last(list *L)
{
  list *i = L;
  while (i != NULL && i->tail != NULL) i=i->tail;
  return i;
}

int main()
{
  list *A = new list(2,new list(3,new list(5,NULL)));
  cout << last(A)*2 << endl;
  return 0;
}