  Novel effects emerge from an interplay between multiple Andreev reflections
and Coulomb interaction in quantum dot coupled to superconducting leads and
subject to a finite potential bias $V$. Combining an intuitive physical picture
with rigorous path integral formalism we evaluate the current $I$ through the
dot and find that the interaction shifts the subharmonic pattern of the $I-V$
curve is shifted toward higher $V$. For sufficiently ^M strong interaction the
subgap current (at $eV < 2 \Delta$) is virtually suppressed.
