Let ${\rm{A}} = \{ - 3, - 2, - 1,0,1,2,3\} $. Let R be a relation on A defined by $x{\rm{R}}y$ if and only if $0 \le {x^2} + 2y \le 4$ . Let $l$ be the number of elements in R and $m$ be the minimum number of elements required to be added in R to make it a reflexive relation. Then $l + m$ is equal to