  The energy spectra for five elemental groups (p, He, C, Si, Fe) of cosmic
rays, are simulated. Calculations are based on an analysis of superposition of
few cosmic ray sources (Supernovae of different types) and principles of
diffusive shock acceleration. Results of the analysis in the knee region show
that summarizing energy spectra for elemental mass groups of cosmic rays can
have significant oscillations of spectral index $\gamma$. Moreover, a kink
(increasing $\gamma$) in Fe spectrum at energy $2\cdot 10^{15}$ eV, is
discovered. In order to distinguish from the knee (decreasing $\gamma$) the
kink can be called an anti-knee (increasing $\gamma$).
