How can i make a 1 count as 11 if its best in blackjack

i want to create a function that optimally calculates a hand of cards according to blackjack rules

this is what i have so far, but it doesnt seem to be able to count ace as 11

does any1 know why the if sentence doesnt work or what i could do instead?

function score = blackjack(hand)
hand = [10 1]

score = sum(hand);

if score <= 11 & hand==1
   score = score + 10;
end
   
if (score > 21)
   score = 0;
end

Answer 1

[Walter Roberson]

if score <= 11 && ismember(1, hand)