function err = KB13Fs(x)
%

F(1) = -0.46769+(1-x(4));
F(2) = -0.84037+(1-x(4))+(1-x(1))+x(3)+x(5)-(1-x(4))*(1-x(1))-(1-x(4))*x(3)-(1-x(4))*x(5)-(1-x(1))*x(3)-(1-x(1))*x(5)-x(3)*x(5)+(1-x(4))*(1-x(1))*x(3)+(1-x(4))*(1-x(1))*x(5)+(1-x(4))*x(3)*x(5)+(1-x(1))*x(3)*x(5)-(1-x(4))*(1-x(1))*x(3)*x(5);
err = norm(F);
