  We offer a simple method Monte Carlo for computation of Volterra's and
spherical type multiple integrals with weak (integrable) singularities.
  An elimination of infinity of variance is achieved by incorporating
singularities in the density, and we offer a highly effective way for
generation of appeared multidimensional distribution.
  We extend offered method onto multiple Volterra's and spherical integrals
with weak singularities containing parameter.
