private static int getRandom(int[] arry) {
		Random random = new Random();
		int randomNum;
		do {
			randomNum = random.nextInt(100);
		} while (isExist(arry, randomNum));
		
		for (int i=0; i<arry.length; i++) {
			if (arry[i] == randomNum) getRandom(arry);
		}
		return randomNum;
	}