Consider the following program:
int f (int * p, int n)
{
if (n <= 1) return 0;
else return max (f (p+1, n-1), p[0] - p[1]);
}
int main ()
{
int a[] = {3, 5, 2, 6, 4};
printf(" %d", f(a, 5));
}
Note: $\max (x, y)$ returns the maximum of $x$ and $y$.
The value printed by this program is ________.