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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Is this when n=0 (the sixth testcase)? If so, the input value is 0 and therefore the sum should be 0. The testcases are correct as 2655 people (including me) passed the Kata. Post your code if you're still having trouble, otherwise I can't be much help.