What is the time complexity of adding n numbers

If I have to add arbitrary numbers like the numbers 1,12,14,71,83,21... then what would be the time complexity of this operation?

I know that adding two numbers is O(1), but how about a list of n numbers. Assuming I'm using the best possible data structure to store them for this purpose, if at all that can have any impact on the process!

Thanks in advance!


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