  In the framework of the density functional theory of freezing proposed in our
previous works, we calculate the phase diagram of two-dimensional system of
particles interacting through the repulsive shoulder potential. This potential
consists of the hard core and repulsive shoulder of the larger radius. It is
shown that at low densities the system melts through the continuous transition
in accordance with the Kosterlitz-Thouless-Halperin-Nelson-Young (KTHNY)
scenario, while at high densities the conventional first order transition takes
place.
