Comparing all the values in an array list

So basically I have an arrayList of numbers that I want to compare against each other so that I can return the value with the highest number.
For example if I had an arrayList with the values 3, 4, 6, and 5 I would want it to return 6.
I've been fooling around with this for a while and it seems to be a simple problem but I'm not getting anywhere.
Also, if this problem can be better solved with something like a HashSet I could do that as well.
Thanks in advance for any replies.

It doesn't really matter what you implement with, the solution is basically the same.
You iterate through your list saving the highest value each time, then return the value you have saved.

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According to your post, my understanding is that you wanted to get the values of a item in a list using the SharePoint Designer.
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Comparing all the values in an array list

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