(2) The sum of the elements of all subsets of a 3-element set $S$ is equal to 2012 (the sum of the elements of the empty set is considered to be zero), then the sum of the elements of $S$ is $\qquad$ .
(2) 503 Prompt: Let $S=\{a, b, c\}$, then $2^{2}(a+b+c)=2012$, so $a+b+c=503$.