class Solution {
    public int subtractProductAndSum(int n) {
        String nString = String.valueOf(n);
        int product = 1, sum = 0, d;

        for (int i = 0;i < nString.length();i++) {
            d = Character.getNumericValue(nString.charAt(i));
            product *= d;
            sum += d;
        }

        return product - sum;
    }
}