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A simple model of Bose-Einstein condensation of interacting particles isproposed. It is shown that in the condensate state the dependence ofthermodynamic quantities on the interaction constant does not allow anexpansion in powers of the coupling constant. Therefore it is impossible topass to the Einstein model of condensation in an ideal Bose gas by means of alimiting passage, setting the interaction constant to zero. The account for theinteraction between particles eliminates difficulties in the description ofcondensation available in the model of an ideal gas, which are connected withfulfillment of thermodynamic relations and an infinite value of the particlenumber fluctuation in the condensate phase.