Sets, Relations and Functions: JEE Main 2025 Mathematics question

Let $A = \{-3,-2,-1,0,1,2,3\}$ and $R$ be a relation on $A$ defined by $xRy$ iff $2x - y \in \{0,1\}$. Let $\ell$ be the number of elements in $R$. Let $m$ and $n$ be the minimum numbers of elements that must be added to $R$ to make it reflexive and symmetric, respectively. Then $\ell + m + n$ is equal to: