Max Groups Fresh Donuts

Given a batch size and group donut demands, reorder groups to maximize the number that receive fresh donuts. A group gets fresh donuts when a new batch is started for them.

Examples
Input: [3,[1,2,3,2,3,1,2,3,2]]
Output: 5
Hints

Max Groups Fresh Donuts

Given a batch size and group donut demands, reorder groups to maximize the number that receive fresh donuts. A group gets fresh donuts when a new batch is started for them.