function F = KBg28F(x)
%

F(1) = -0.84178 + (1-x(5)) + x(1) + x(4) - x(6)*x(4) - x(7)*x(1) - x(7)*x(4) + x(7)*x(6)*x(4);
F(2) = -0.70844 + (1-x(2)) + x(1) - x(8)*x(1);
F(3) = -0.88847 + (1-x(2)) + x(3) + x(4) - x(9)*x(4) - x(10)*x(3) - x(10)*x(4) + x(10)*x(9)*x(4);
F(4) = -0.84215 + (1-x(4)) + (1-x(3)) + (1-x(2)) - x(11)*(1-x(2)) - x(12)*(1-x(3)) - x(12)*(1-x(2)) + x(12)*x(11)*(1-x(2));
F(5) = -0.8428 + (1-x(3)) + x(1) + x(4) - x(13)*x(4) - x(14)*x(1) - x(14)*x(4) + x(14)*x(13)*x(4);
F(6) = -0.84945 + (1-x(5)) + (1-x(2)) + (1-x(1)) - x(15)*(1-x(1)) - x(16)*(1-x(2)) - x(16)*(1-x(1)) + x(16)*x(15)*(1-x(1));
F(7) = -0.93914 + (1-x(5)) + x(2) + x(3) - x(17)*x(3) - x(18)*x(2) - x(18)*x(3) + x(18)*x(17)*x(3);
F(8) = -0.55948 + (x(1));
F(9) = -0.86849 + (1-x(4)) + (1-x(3)) + (1-x(1)) - x(19)*(1-x(1)) - x(20)*(1-x(3)) - x(20)*(1-x(1)) + x(20)*x(19)*(1-x(1));
F(10) = -0.80087 + x(1) + x(5) - x(21)*x(5);
F(11) = -0.91365 + (1-x(5)) + (1-x(2)) + x(4) - x(22)*x(4) - x(23)*(1-x(2)) - x(23)*x(4) + x(23)*x(22)*x(4);
F(12) = -0.89795 + (1-x(5)) + x(3) + x(4) - x(24)*x(4) - x(25)*x(3) - x(25)*x(4) + x(25)*x(24)*x(4);
F(13) = -0.83683 + (1-x(2)) + x(1) + x(4) - x(26)*x(4) - x(27)*x(1) - x(27)*x(4) + x(27)*x(26)*x(4);
