static int findMissingNumber(int start, int end, List<Integer> list) {
		list.sort(new Comparator<Integer>() {
			@Override
			public int compare(Integer o1, Integer o2) {
				return o1 - o2;
			}
		});
		System.out.println(list);
		for (Integer i : list) {
			if (i != start)
				return start;
			start++;
		}
		return end;
	}