function F = KBg20F(x)
%

F(1) = -0.54733 + (x(5));
F(2) = -0.8843 + (1-x(3)) + (1-x(2)) + x(5) - x(6)*x(5) - x(7)*(1-x(2)) - x(7)*x(5) + x(7)*x(6)*x(5);
F(3) = -0.8843 + (1-x(5)) + (1-x(3)) + x(2) - x(8)*x(2) - x(9)*(1-x(3)) - x(9)*x(2) + x(9)*x(8)*x(2);
F(4) = -0.92536 + x(3) + x(4) + x(5) - x(10)*x(5) - x(11)*x(4) - x(11)*x(5) + x(11)*x(10)*x(5);
F(5) = -0.55564 + (x(2));
F(6) = -0.79427 + (1-x(1)) + x(2) - x(12)*x(2);
F(7) = -0.85775 + (1-x(2)) + x(3) + x(5) - x(13)*x(5) - x(14)*x(3) - x(14)*x(5) + x(14)*x(13)*x(5);
F(8) = -0.6882 + (1-x(2)) + x(3) - x(15)*x(3);
