function F = KBg57F(x)
%

F(1) = -0.74837 + x(2) + x(4) - x(6)*x(4);
F(2) = -0.71951 + (1-x(5)) + x(2) - x(7)*x(2);
F(3) = -0.53451 + (1-x(2));
F(4) = -0.76968 + (1-x(2)) + x(3) - x(8)*x(3);
F(5) = -0.90905 + (1-x(4)) + (1-x(3)) + (1-x(2)) - x(9)*(1-x(2)) - x(10)*(1-x(3)) - x(10)*(1-x(2)) + x(10)*x(9)*(1-x(2));
F(6) = -0.87922 + x(2) + x(3) + x(4) - x(11)*x(4) - x(12)*x(3) - x(12)*x(4) + x(12)*x(11)*x(4);
F(7) = -0.82379 + (1-x(3)) + x(1) - x(13)*x(1);
F(8) = -0.74341 + x(2) + x(3) - x(13)*x(3);
