function F = KBg80F(x)
%

F(1) = -0.81624 + x(1) + x(5) - x(6)*x(5);
F(2) = -0.8534 + (1-x(1)) + x(2) + x(4) - x(7)*x(4) - x(8)*x(2) - x(8)*x(4) + x(8)*x(7)*x(4);
F(3) = -0.83239 + x(1) + x(3) - x(9)*x(3);
