Given a set of integers (it can contain equal elements).

You have to split it into two subsets A and B (both of them can contain equal elements or be empty). You have to maximize the value of mex(A)+mex(B).

Here mex of a set denotes the smallest non-negative integer that doesn't exist in the set. For example: 

  * mex(\{1,4,0,2,2,1\})=3 
  * mex(\{3,3,2,1,3,0,0\})=4 
  * mex(∅)=0 (mex for empty set) 



The set is splitted into two subsets A and B if for any integer number x the number of occurrences of x into this set is equal to the sum of the number of occurrences of x into A and the number of occurrences of x into B.

Input

The input consists of multiple test cases. The first line contains an integer t (1≤ t≤ 100) — the number of test cases. The description of the test cases follows.

The first line of each test case contains an integer n (1≤ n≤ 100) — the size of the set.

The second line of each testcase contains n integers a_1,a_2,... a_n (0≤ a_i≤ 100) — the numbers in the set.

Output

For each test case, print the maximum value of mex(A)+mex(B).

Example

Input


4
6
0 2 1 5 0 1
3
0 1 2
4
0 2 0 1
6
1 2 3 4 5 6


Output


5
3
4
0

Note

In the first test case, A=\left\{0,1,2\right\},B=\left\{0,1,5\right\} is a possible choice.

In the second test case, A=\left\{0,1,2\right\},B=∅ is a possible choice.

In the third test case, A=\left\{0,1,2\right\},B=\left\{0\right\} is a possible choice.

In the fourth test case, A=\left\{1,3,5\right\},B=\left\{2,4,6\right\} is a possible choice.
1
100
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
 15
1
0
1
1
2
0 0
2
0 1
2
1 1
2
0 2
2
1 2
3
0 0 0
3
0 1 0
3
0 1 2
4
0 1 2 3
4
1 1 2 3
4
0 1 0 1
4
0 0 0 1
5
0 0 0 0 0

100
 1
0
2
2
0
1
0
2
3
3
4
0
4
3
2

import java.awt.Paint;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigInteger;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.Deque;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Queue;
import java.util.Set;
import java.util.Stack;

public class CodeForces {
	
	static class Track{
		
		int start;
		int end;
		
		public Track(int start, int end) {
			super();
			this.start = start;
			this.end = end;
		}

		@Override
		public String toString() {
			return "Track [start=" + start + ", end=" + end + "]";
		}

		@Override
		public int hashCode() {
			final int prime = 31;
			int result = 1;
			result = prime * result + end;
			result = prime * result + start;
			return result;
		}
		
		
		
		
	}

	static class Range {

		String s;

		public Range(String s) {
			this.s = s;
		}

		@Override
		public String toString() {
			return s;
		}
	}

	static class RangeComparator implements Comparator<Range> {

		public int compare(Range o1, Range o2) {
			String[] v1 = o1.s.split("#");
			String[] v2 = o2.s.split("#");
			int val1 = Integer.parseInt(v1[1]) - Integer.parseInt(v1[0]);
			int val2 = Integer.parseInt(v2[1]) - Integer.parseInt(v2[0]);
			if (val1 > val2) {
				return -1;
			} else if (val2 > val1) {
				return 1;
			}
			return o1.s.compareTo(o2.s);
		}

	}

	public static void printArray(int[] arr) {
		for (int i = 0; i < arr.length; i++) {
			System.out.print(arr[i] + " ");
		}
		System.out.println();
	}

	public static int[] getIntArray(BufferedReader br) throws IOException {
		String line = br.readLine();
		String[] values = line.split(" ");
		int[] arr = new int[values.length];
		for (int i = 0; i < values.length; i++) {
			arr[i] = Integer.parseInt(values[i]);
		}
		return arr;
	}

	public static long[] getLongArray(BufferedReader br) throws IOException {
		String line = br.readLine();
		String[] values = line.split(" ");
		long[] arr = new long[values.length];
		for (int i = 0; i < values.length; i++) {
			arr[i] = Long.parseLong(values[i]);
		}
		return arr;
	}
	
	public static List<Long> getLongList(BufferedReader br) throws IOException {
		String line = br.readLine();
		String[] values = line.split(" ");
		List<Long> list = new ArrayList<>();
		for (int i = 0; i < values.length; i++) {
			list.add(Long.parseLong(values[i]));
		}
		return list;
	}
	
	public static String[] getStringArray(BufferedReader br) throws IOException {
		String line = br.readLine();
		String[] values = line.split(" ");
		return values;
	}

	public static Set<Integer> getFactors(int n) {
		Set<Integer> set = new HashSet<>();
		for (int i = 2; i <= Math.sqrt(n); i++) {
			if (n % i == 0) {
				set.add(i);
				set.add(n / i);
			}
		}
		return set;
	}

	public static int[] decode(String s) {
		String[] v = s.split("#");
		int[] arr = new int[2];
		arr[0] = Integer.parseInt(v[0]);
		arr[1] = Integer.parseInt(v[1]);
		return arr;
	}

	public static String encode(int a, int b) {
		return a + "#" + b;
	}

	public static long lcm(long a, long b) {
		BigInteger bigGCD = BigInteger.valueOf(a).gcd(BigInteger.valueOf(b));
		long val = bigGCD.longValue();
		long prod = a * b;
		return prod / val;
	}

	public static Set<Integer> getPrimes() {
		Set<Integer> primes = new HashSet<>();
		for (int i = 2; i < 20000; i++) {
			int fac = 0;
			for (int j = 1; j <= Math.sqrt(i); j++) {
				if (i % j == 0) {
					fac += 2;
				}
			}

			if (fac == 2) {
				primes.add(i);
			}
		}

		System.out.println(primes.size());

		return primes;
	}
	

	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String line = br.readLine();
		int t = Integer.parseInt(line);		
//		int t = 1;

		while (t-- > 0) {
			line = br.readLine();
			int n = Integer.parseInt(line);
			int[] arr = getIntArray(br);
//			int k = arr[1];
//			List<Long> list = getLongList(br);
			
			Arrays.sort(arr);
			
			int[] count = new int[101];
			
			for(int i=0;i<n;i++){
				count[arr[i]]++;
			}
			
			int s1=0; int s2=0;
			
			for(int i=0;i<=100;i++){
				if(count[i]>=2){
					s1++;
					s2++;
				}else if(count[i]==0){
					break;
				}else{
					s1++;
				}
			}
			
			System.out.println(s1+s2);
			
			
			
			
			
		}

	}
	

}


