Let $A = \{ - 4, - 3, - 2,01,3,4\}$ and $R = \{(a,b) \in A \times$ $A:b = |a|$ or $b^{2} = a + 1\}$ be a relation on $A$. Then the minimum number of elements, that must be added to the relation $R$ so that it becomes reflexive and symmetric, is $\$