check digit for the 13-digit code obtained by replacing M with 9790. In other words, the old and new codes differ only by the replacement of M with 9790, with no change in the check digit. This differs from, for example, the ISBN to EAN mapping where the check digit must be recalculated.

Examples

For instance, for the item with ISMN beginning 979-0-060-11561:
: 1×9 + 3×7 + 1×9 + 3×0 + 1×0 + 3×6 + 1×0 + 3×1 + 1×1 + 3×5 + 1×6 + 3×1
: = 9 + 21 + 9 + 0 + 0 + 18 + 0 + 3 + 1 + 15 + 6 + 3

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