Hello, Please help me fill the circles with colors randomly on the following image using matlab, below is the code and the image, thank you for your help in advance

% initializing image with white background

img=255*ones(256,256);

% ring center

h=128;k=128;

t=210:30:540;

% circle max radius

r=22;

% ring radius

R=80+r;

% generating centres for circle

x=round(R*cosd(t)+h);

y=round(R*sind(t)+k);

% coloring circles

for n=1:12

r=10:22;

for i=x(n)-r(n):x(n)+r(n)

for j=y(n)-r(n):y(n)+r(n)

if sqrt((i-x(n))^2+(j-y(n))^2)

img(i,j)=200;

end

end

end

end

% converting matrix to image

img=uint8(img);

% displaying image

imshow(img)