Phenomenological model of chiral polar smectics is introduced with interactions up to the fourth neighboring layers. The minimization of the free energy gives three stable structures: the ferroelectric Sm C* phase, the antiferroelectric Sm C-A* phase and the hellicoidally modulated structure of the Sm C-H* phase. The Sm C-H* phase can be recognized as the Sm C-alpha*, phase below Sm A phase and as the Sm C-FI2* phase or as the Sm C-FI1* phase when appearing between the Sm C* phase and the Sm C-A* phase. Stability of these phases is analyzed and the phase diagram in the space of model parameters is presented.