Jester was sitting at a table in the library. Sammy thought that he was unusually quiet and went to check on him. When he looked over Jester's shoulder, he saw a piece of paper with this written on it.

What digit, when 3 of itself are added together, equals 12? The answer is not 4.

"Where did you get this from?" Sammy asked Jester.

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"His Majesty gave this to me." Jester groaned back. "He says I can't enter the throne room until I figure this problem out."

"There are only 9 digits. What is stopping you from guessing?" Sammy asked as he sat down next to Jester.

"The king said I have one chance to answer. If I get this wrong, I have to go on an expedition with Knight into the forest. If I do get the correct answer, I have to prove it is correct. If I can't prove it, expedition it is..." Jester replied.

As Jester slumped onto the table, Sammy thought to himself, 'It's been a while since I've been hiking. Maybe I should join the expedition.'