Belgian Mystery Number

Can you solve this problem asked to 14 and 15 year olds in the Belgian Mathematical Olympiad?

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My Books (US links)
Mind Your Decisions: Five Book Compilation
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A collection of 5 books:
“The Joy of Game Theory” rated 4.2/5 stars on 105 reviews
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“The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias” rated 3.6/5 stars on 10 reviews
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“40 Paradoxes in Logic, Probability, and Game Theory” rated 4.1/5 stars on 20 reviews
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“The Best Mental Math Tricks” rated 4.4/5 stars on 25 reviews
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“Multiply Numbers By Drawing Lines” rated 4.5/5 stars on 16 reviews
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Mind Your Puzzles: Collection Of Volumes 1 To 3
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A collection of 3 books:
“Math Puzzles Volume 1” rated 4.5/5 stars on 30 reviews
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“Math Puzzles Volume 2” rated 4.5/5 stars on 10 reviews
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“Math Puzzles Volume 3” rated 4.5/5 stars on 8 reviews
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2017 Shorty Awards Nominee. Mind Your Decisions was nominated in the STEM category (Science, Technology, Engineering, and Math) along with eventual winner Bill Nye; finalists Adam Savage, Dr. Sandra Lee, Simone Giertz, Tim Peake, Unbox Therapy; and other nominees Elon Musk, Gizmoslip, Hope Jahren, Life Noggin, and Nerdwriter.

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