  In this talk it is discussed the derivation of low-frequencies part of quark
determinant and partition function. As a first application, quark condensate is
calculated beyond chiral limit with the account of O(m), O(1/N_c), O(1/N_c m)
and O(1/N_c m ln m) corrections. It is demonstrated complete correspondence of
the results to chiral perturbation theory.
