  The results of numerical and theoretical studies of the gain of direct-drive
inertial confinement fusion (ICF) target, which includes a kinetic description
of energy transfer by laser-accelerated fast electrons, are presented. The
range of initial temperature of fast electrons and fraction of laser energy
contained in these particles were chosen based on the results of recent
experiments at the National Ignition Facility (NIF).The effect of 'wandering'
of fast electrons is taken into account. It is due to a remoteness of the
region of fast electron generation from the ablation surface of imploded
target. As a result a significant fraction of particles do not fall into the
compressed part of target. The `wandering' effect leads to decreasing the
negative effect of fast electron generation on the target's gain.
