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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.
You should find maximum sum of all streams.
Read this comment posted just below your comment less than 24 hrs ago:
https://www.codewars.com/kata/551f23362ff852e2ab000037/discuss#633b61c8c97a6c004257ae4b
and follow all the links in there - "the same problem" has the same solution since 7 years, you just have to read the comments below.