Barrel with specific amount of items

so i need help in java so i was trying to make that procedure will give player an barrel with items that has really specific count(ss can go only form 0 to 15) by my formula:

        // Calculate the maximum number of items based on inputed signal strength
        int items = Math.min((ss + 1) * 115 - 1, 1728);

        // find count of stacks and stack remainder
        int barrelfullStacks = items / 64;
        int barrelremainder = items % 64;