On a nice summer day, two tourists visit the Dutch city of Gouda. During their tour through the center they spot a cosy terrace. They decide to have a drink and, as an appetizer, a portion of hot bitterballs. The waiter tells them that the bitterballs can be served in portions of 6, 9, or 20.
What is the largest number of bitterballs that cannot be ordered in these portions?
1081
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