Paradoc

v]Š .. 3 bytes!

{ .. This delimits a block, which we'll just discard at the end.
  .. I'll explain my Paradoc programs in the block.

v .. Treat input as "values", so those that can be interpreted as
  .. ints, will.
] .. Collect all input values into a list.
Š .. Compute the sum.
  .. At program termination, the stack, which contains the sum,
  .. is implicitly printed.
};