Let K 0 (V C ) be the Grothendieck ring of complex quasi-projective varieties. This is the abelian group generated by isomorphism classes [X] of such varieties modulo the relationLet Hilb n X , n ≥ 1, be the Hilbert scheme of zero-dimensional subschemes of length n of a complex quasi-projective variety X. According to [4], Hilb n X * Math. Subject Class.: 14C05, 14G10 † Partially supported by the grants RFBR-007-00593, INTAS-05-7805 and NWO-RFBR 047.011.2004.