Problem: This problem is actually a subproblem of problem G from the same contest.

There are n candies in a candy box. The type of the i-th candy is a_i (1 ≤ a_i ≤ n).

You have to prepare a gift using some of these candies with the following restriction: the numbers of candies of each type presented in a gift should be all distinct (i. e. for example, a gift having two candies of type 1 and two candies of type 2 is bad). 

It is possible that multiple types of candies are completely absent from the gift. It is also possible that not all candies of some types will be taken to a gift.

Your task is to find out the maximum possible size of the single gift you can prepare using the candies you have.

You have to answer q independent queries.

If you are Python programmer, consider using PyPy instead of Python when you submit your code.

Input

The first line of the input contains one integer q (1 ≤ q ≤ 2 ⋅ 10^5) — the number of queries. Each query is represented by two lines.

The first line of each query contains one integer n (1 ≤ n ≤ 2 ⋅ 10^5) — the number of candies.

The second line of each query contains n integers a_1, a_2, ..., a_n (1 ≤ a_i ≤ n), where a_i is the type of the i-th candy in the box.

It is guaranteed that the sum of n over all queries does not exceed 2 ⋅ 10^5.

Output

For each query print one integer — the maximum possible size of the single gift you can compose using candies you got in this query with the restriction described in the problem statement.

Example

Input


3
8
1 4 8 4 5 6 3 8
16
2 1 3 3 4 3 4 4 1 3 2 2 2 4 1 1
9
2 2 4 4 4 7 7 7 7


Output


3
10
9

Note

In the first query, you can prepare a gift with two candies of type 8 and one candy of type 5, totalling to 3 candies.

Note that this is not the only possible solution — taking two candies of type 4 and one candy of type 6 is also valid.

Solution (in JAVA):

Solution:
import java.util.*;
import java.lang.*;
import java.io.*;
public class Codechef
{   static long mod=Long.MAX_VALUE;
	public static void main (String[] args) throws java.lang.Exception
	{   int i,j;
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		PrintWriter out=new PrintWriter(System.out);
		
		
		int q=Integer.parseInt(br.readLine());
		while(q--!=0)
		{
		    int n=Integer.parseInt(br.readLine());
		    String s[]=br.readLine().split(" ");
		    int a[]=new int[n];
		    ArrayList<Integer> arr=new ArrayList<Integer>();
		    HashMap<Integer,Integer> hm=new HashMap<Integer,Integer>();
		    for(i=0;i<n;i++)
		        {   a[i]=Integer.parseInt(s[i]);
		            if(!hm.containsKey(a[i]))
		                hm.put(a[i],1);
		             else
		                hm.put(a[i],hm.get(a[i])+1);
		        }
		    for(int c:hm.values())
		       arr.add(c);
		    Collections.sort(arr,Collections.reverseOrder());
		    HashSet<Integer> set=new HashSet<Integer>();
		    int max=Integer.MAX_VALUE;
		    for(int x:arr)
		    {   
		        if(max<=0)
		            break;
		        if(x==max)
		        {  set.add(x);
		           max--;
		        }
		        else if(x<max)
		            {set.add(x);
		            max=x-1;}
		        else if(x>max)
		        {   set.add(max);
		            max--;
		        }
		    }
		    long sum=0;
		    for(int c:set)
		        sum+=c;
		      out.println(sum);  
		}
		out.close();
	}
}