Consecutive Adding

You are given two matrices $A$ and $B$, each with $R$ rows (numbered $1$ through $R$) and $C$ columns (numbered $1$ through $C$). Let's denote an element of $A$ or $B$ in row $i$ and column $j$ by $A_{i,j}$ or $B_{i,j}$ respectively. You are also given an integer $X$. You may perform the following operation on $A$ any number of times: - Choose an integer $v$. - Choose $X$ consecutive elements