A seafood store carries 2-sized tins of oysters. One contains 5 oysters and the other contains 7 oysters.
Bill wishes to feed his guests exactly 1 oyster each and have none left over. What is the largest number of guests he **can't** feed?

Some of the numbers that fit the criteria are 1, 2, 3, 4, 6, 8, 9, 11... Find the largest.

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