  We study paramagnetic - ferromagnetic transition due to exchange interaction
between classical localized magnetic moments and conduction electrons. We
formulate the Dynamical Mean Field Approximation equations for arbitrary
electron dispersion law, concentration and relation between exchange coupling
and the electron band width. Solving these equations we find explicit formula
for the transition temperature $T_c$. We present the results of calculations of
the $T_c$ for the semi-circular electron density of states.
