calculate optimum point in a list

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Hello guys so I have a list of around 1000 items, and each item has the following properties:

price (euros)
points (number)

I can have 20 items in a set, and have a budget of 1000 euros.

I want to find the optimum item list so that I have the most points.

I assume there must be a name for this kind of problem, could someone tell me what I need to google to find a solution to this problem? I can do the calculations myself, am just stuck on how the problem is called

Thanks!