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Shlomi Fish committed f8e87ce

Add the description for the problem, so it will be easy to grep.

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project-euler/160/euler-160-description.txt

+For any N, let f(N) be the last five digits before the trailing zeroes in N!.
+For example,
+
+9! = 362880 so f(9)=36288
+10! = 3628800 so f(10)=36288
+20! = 2432902008176640000 so f(20)=17664
+
+Find f(1,000,000,000,000)