BigInteger mult = new BigInteger("1");
        BigInteger sum = new BigInteger("0");
        for (int i = 2; i <= num; i++) {
            mult = mult.multiply(new BigInteger(String.valueOf(i)));
        }
        String sMult = String.valueOf(mult);
        for (int i = 0; i < sMult.length(); i++) {
            String arg = String.valueOf(sMult.charAt(i));
            sum = sum.add(new BigInteger(arg));
        }
        System.out.println(sum);