Calculate the factorial of any non-negative integer quickly and accurately.
The factorial formula is:
n! = 1⋅2⋅3⋅4⋅…⋅n
For example:
3! = 1⋅2⋅3 = 6
4! = 1⋅2⋅3⋅4 = 24
5! = 1⋅2⋅3⋅4⋅5 = 120
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