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Omni-MATH / M is an 8×8 matrix. For 1≤i≤8, all entries in row i are at least i, and all entries on column i are at least i. What is the minimum possible sum of the entries of M ?

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problem

MM is an 8×88 \times 8 matrix. For 1≤i≤81 \leq i \leq 8, all entries in row ii are at least ii, and all entries on column ii are at least ii. What is the minimum possible sum of the entries of MM ?
Plain-text mathematical notation (without MathML)
M is an 8×8 matrix. For 1≤i≤8, all entries in row i are at least i, and all entries on column i are at least i. What is the minimum possible sum of the entries of M ?
Original LaTeX notation
$M$ is an $8 \times 8$ matrix. For $1 \leq i \leq 8$, all entries in row $i$ are at least $i$, and all entries on column $i$ are at least $i$. What is the minimum possible sum of the entries of $M$ ?

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