type = 'max';
A = [
%x1  x2   x3   x4   x5   x6   x7   x8   x9  x10  x11  x12  x13  x14  x15  x16   
1    0    0    0    1    0    0    0    1    0    0    0    1    0    0    0;
0    1    0    0    0    1    0    0    0    1    0    0    0    1    0    0;
0    0    1    0    0    0    1    0    0    0    1    0    0    0    1    0;
0    0    0    1    0    0    0    1    0    0    0    1    0    0    0    1;
320  0    0    0    510  0    0    0    630  0    0    0    125  0    0    0;    
0    320  0    0    0    510  0    0    0    630  0    0    0    125  0    0;    
0    0    320  0    0    0    510  0    0    0    630  0    0    0    125  0;    
0    0    0    320  0    0    0    510  0    0    0    630  0    0    0    125;
1    1    1    1    0    0    0    0    0    0    0    0    0    0    0    0;
0    0    0    0    1    1    1    1    0    0    0    0    0    0    0    0;
0    0    0    0    0    0    0    0    1    1    1    1    0    0    0    0;
0    0    0    0    0    0    0    0    0    0    0    0    1    1    1    1];

h = [18; 32; 25; 17; 11930; 22552; 11209; 5870; 16; 32; 40; 28];

% c is row vector form of following matrix C
C = [135; 200; 410; 520] * [1 1.1 1.2 1.3];
c = C';
c = c(:)';

sign = ones(1,12) * -1;

[z,x_B,index_B] = simplex (type,A,h,c,sign);
histogram([index_B x_B']')