Let 1<c<11/10. In the present paper it is proved that there exists a numberN(c)>0 such that for each real numberN>N(c) the inequality|pc1+pc2+pc3.N|<N.1c(1110.c)logc1N is solvable in prime numbersp 1,p 2,p 3, wherec 1 is some absolute positive constant.