public int maxStreak(){
		int max_streak = 1, cur_streak = 1;
		for (int i=1; i<cards.length; i++){
			if (cards[i] == cards[i-1]+1)
				cur_streak++;
			else{
				if (cur_streak > max_streak)
					max_streak = cur_streak;
				cur_streak = 1;
			}
		}
		return max_streak;
	}