What have you tried? Why not? And why did you feel you needed a picture of the vector S? That just makes us type it in. Not gonna happen. Just because you want fancy formatting makes it more difficult for you to get help?
S = sort(randi(100,[1,10]))
Next, learn to use VECTORS. Don't number your variables. Silly, becuase we know you have been using MATLAB for a while.
It looks like you want to find the closest elements in S to each of the members of a. Then form the sum.
a = [10:20:100]
[~,minind] = min((a' - S).^2,[],2);
V = S(minind)
sum(V)
