function y = D3(x)
y = zeros(5,1);
a = x(2)+x(3);
b = x(3)-x(2);
y(1) = x(1);
y(2) = x(1)+a;
y(3) = x(1)+b;
y(4) = a+a+b+y(2);
y(5) = x(3);
