public static String fairRations(List<Integer> B) {
        int[] arr = B.stream().mapToInt(Integer::intValue).toArray();
        int count = 0;
        for(int i = 0; arr.length>1 && i< arr.length; i++){
            if(arr[i]%2 != 0 && i + 1 < arr.length) {
                arr[i]++;
                arr[i + 1]++;
                count += 2;
            }
        }
        return arr[arr.length-1]%2 == 0 ? String.valueOf(count) : "NO";
    }