Ononot — Find the trace of matrix B = \begin{pmatrix} 5 & 2 & 1 \\ 0

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Find the trace of matrix $B = \begin{pmatrix} 5 & 2 & 1 \\ 0 & 3 & 4 \\ -1 & 2 & 6 \end{pmatrix}$ (sum of diagonal elements).