Binary operation that associates with every pair of matrices (A, B) of the same dimensions, a new matrix denoted by (A + B) called the sum of the matrices.

The sum of matrices is obtained by adding the corresponding elements (of matrices with the same dimensions).

### Example

$$\begin{pmatrix} 4 & 6\\ 2 & 3 \end{pmatrix} + \begin{pmatrix} 1 & 7\\ 5 & 8 \end{pmatrix} = \begin{pmatrix} 4 + 1 & 6 + 7\\ 2+5 & 3 + 8 \end{pmatrix} = \begin{pmatrix} 5 & 13\\ 7 & 11 \end{pmatrix}$$