Mr$.$ X is considering starting a new business of selling hoodies with UNCW$-$logo$.$ The annual demand is $1000.$ Assume that demand is perfectly steady throughout time. Mr$.$ X can purchase the hoodies from supplier Mr$.$ Y for a price of $$40$ per hoodie and a $$2000$ fixed cost for every order placed independent of the order size. The annual holding cost for each hoodie is $50\%$ of its wholesale price.

What is the optimal order size? $($Round up$,$ Integer Answer, do not put anything other than numbers.$)$