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 CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
const int N = 200005;
map<int, int> mp;
map<int, int>::iterator it;
int main() {
  int q, n, a;
  int ans = 0, m = 0;
  scanf("%d", &q);
  while (q--) {
    mp.clear();
    scanf("%d", &n);
    int arr[n];
    for (int i = 0; i < n; ++i) {
      scanf("%d", &a);
      it = mp.find(a);
      if (it == mp.end()) {
        mp[a] = 1;
      } else {
        mp[a]++;
      }
    }
    for (int i = 0; i < mp.size(); ++i) {
      arr[i] = mp[i];
    }
    sort(arr, arr + mp.size(), greater<int>());
    ans = arr[0];
    m = arr[0];
    for (int i = 1; i < n; ++i) {
      m = min(m - 1, arr[i]);
      if (m == 0) {
        break;
      }
      ans += m;
    }
    printf("%d\n", ans);
  }
  return 0;
}