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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.
It's okay! Keep trying :)
537 people have already solved this kata in C#.
At least if you want to put the "I'm not an experienced programmer" part you don't want to be also so arrogant for the other half of your post.
Anyways, there are test cases with
r = 1000000000. Think about how to handle that.