Parentheses
Add parentheses to make the result as large as possible:
`10000-1000-100-10-1`
Difficulty level (1 very easy - 10 very hard): 2
Sources:
- Young Mathematician Olympiad, 2018-2019, Final, Grades 3-4 Question 2
- Young Mathematician Olympiad, 2018-2019, Final, Grades 5-6 Question 1
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