#J, 15 chars, 3 tie breakers, incomplete program

This is my J attempt. It is not a full program, because I have not yet figured out how to write one. Just put that line in a script to get the function `p` that can be used for adding an arbitrary amount of numbers. It is a monad and takes a list of numbers to add (such as `p 1 2 3 4`):

    p=:[:#[:;<@i."0