function err = KB91Fs(x)
%

F(1) = -0.090732+(1-x(4));
F(2) = -0.66364+x(5);
F(3) = -0.97043+(1-x(5))+(1-x(2))+(1-x(1))+x(4)-(1-x(5))*(1-x(2))-(1-x(5))*(1-x(1))-(1-x(5))*x(4)-(1-x(2))*(1-x(1))-(1-x(2))*x(4)-(1-x(1))*x(4)+(1-x(5))*(1-x(2))*(1-x(1))+(1-x(5))*(1-x(2))*x(4)+(1-x(5))*(1-x(1))*x(4)+(1-x(2))*(1-x(1))*x(4)-(1-x(5))*(1-x(2))*(1-x(1))*x(4);
err = norm(F);
