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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.
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The task is asking for the maximum sum of money that can be earned by the nth day, not on the nth day.
The Description needs improvement on explaining the task in a coherent way. I'd strongly recommend putting more detail in how the solution is obtained in the example given the shortcomings of the rest of the Description.