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We consider the proximity effect in a normal dot coupled to a bulksuperconducting reservoir by the tunnel contact with large normal conductance.Coulomb interaction in the dot suppresses the proximity minigap induced in thenormal part of the system. We find exact expressions for the thermodynamic andtunneling minigaps as functions of the junction's capacitance. The tunnelingminigap interpolates between its proximity-induced value in the regime of weakCoulomb interaction to the Coulomb gap in the regime of strong interaction. Inthe intermediate case a non-universal two-step structure of the tunnelingdensity of states is predicted. The charge quantization in the dot is alsostudied.Comment: 4 pages (RevTeX), 3 figures. Version 2: minor corrections, a figure  and two references adde

Coulomb Blockade of Proximity Effect at Large Conductance