  Let Y be a complex algebraic curve and let [Y]={X_1,...,X_n} be the set of
all real algebraic curves X_i with complexification X_i(C)=Y, such that the
real points X_i(R) divide X_i(C). We find all such families [Y]. According to
Harnak theorem a number |X_i| of connected components of X_i(R) satifies by the
inequality |X_i|<= g+1, where g is the genus of Y. We prove that SUM |X_i| <=
2g-(n-9) 2^{n-3}-2 <= 2g+30 and these estimates are exact.
