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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.
Your code with time out with a linear solution (= if you iterate until n). You must find a more efficient approach. I believe any concrete hint would spoil the solution, this is relatively basic arithmetics for a 4kyu kata.