public List<Integer> getTaskXPriorityForcast(){
		List<Integer> taskXPriorityForcast = new ArrayList<Integer>();
		List<Task> tasksTemp = getAllTasks();
		int maxPriority = sortTasksByPriority(tasksTemp);
		List<Integer> prioritys = new ArrayList<Integer>();
		for(Task task : tasksTemp){
			prioritys.add(task.getPriority());
		}
		
		for(int i=0;i<=maxPriority+1;i++){
			int index = Collections.binarySearch(prioritys, i);
			if(index < 0){
				taskXPriorityForcast.add(i);
			}
		}
		return taskXPriorityForcast;
	}