  The cross section of the process $e^+e^- \to 3(\pi^+\pi^-)\pi^0$ has been
measured for the first time using a data sample of 56.7 pb$^{-1}$ collected
with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider. 632$\pm$32 signal
events have been selected in the center-of-mass energy range 1.6 -- 2.0 GeV. A
study of dynamics of seven-pion production allows one to extract contributions
of the dominated $2(\pi^+\pi^-)\omega$ and $2(\pi^+\pi^-)\eta$ intermediate
states.
