function err = IJs(x)
%

F(1) = -0.80896+(1-x(4))+(1-x(3))+x(2)-(1-x(4))*(1-x(3))-(1-x(4))*x(2)-(1-x(3))*x(2)+(1-x(4))*(1-x(3))*x(2);
F(2) = -0.75209+x(1)+x(5)-x(1)*x(5);
F(3) = -0.86576+(1-x(4))+x(3)+x(5)-(1-x(4))*x(3)-(1-x(4))*x(5)-x(3)*x(5)+(1-x(4))*x(3)*x(5);
err = norm(F);
