1import java.util.Arrays;
2
3public class SpecialArray {
4    public int specialArray(int[] nums) {
5        Arrays.sort(nums);
6        int n = nums.length;
7        for (int x = 0; x <= n; x++) {
8            int count = 0;
9            for (int num : nums) {
10                if (num >= x) {
11                    count++;
12                }
13            }
14            if (count == x) {
15                return x;
16            }
17        }
18        return -1;
19    }
20    public static void main(String[] args) {
21        SpecialArray sa = new SpecialArray();
22        int[] nums = {0, 4, 3, 0, 4};
23        System.out.println(sa.specialArray(nums));
24    }
25}

1