#include <bits/stdc++.h>
using namespace std;

signed main(){
  int q;cin>>q;
  while(q--){
    int n;cin>>n;
    map<int,int> m;
    while(n--){
      int a;cin>>a;m[a]++;
    }
    vector<int> v;
    for(auto p:m)v.push_back(p.second);
    int l=0,r=1e9;
    while(r-l>1){
      int mid=(r+l)>>1;
      int a=0;
      for(int p:v)a+=min(mid,p);
      (a>=mid*3?l:r)=mid;
    }
    cout<<l<<endl;
  }
}