It's not that tough.

Geometry Level 5

$\text{If} \quad \left[ \begin{matrix} 1 & 2 & A \\ 0 & 1 & 4 \\ 0 & 0 & 1 \end{matrix} \right] ^N=\left[ \begin{matrix} 1 & 18 & 2007 \\ 0 & 1 & 36 \\ 0 & 0 & 1 \end{matrix} \right]$

then find the value of $(A+N)$.

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