#include <bits/stdc++.h>
using namespace std;
 
// Speed
#define fast_io ios::sync_with_stdio(0); cin.tie(0); cout.tie(0)
 
// Typedefs
#define int long long
#define pb push_back
#define ff first
#define ss second
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) ((int)(x).size())
#define endl '\n'
 
// Loops
#define rep(i,a,b) for(int i=a;i<b;++i)
#define each(x, a) for (auto &x : a)
 
int distinct_count(vector<int> &v) {
    unordered_set<int> st(all(v));
    return st.size();
}
 
// Logic
void solve() {
    int n;
    cin>>n;
    vector <int> a(n);
    unordered_map<int,int> freq;
    rep(i,0,n) {
    	cin>>a[i];
    	freq[a[i]]++;
    }
    int count=0;
    sort(all(a));
    for(int i=0;i<n;i=i+freq[a[i]]){
    	if(freq[a[i]]<a[i]) continue;
    	else count=count+freq[a[i]];
    }
    cout<<n-count<<endl;
}
 
 
// Main
int32_t main() {
    fast_io;
    int t;
    cin>>t;
    while (t--) solve();
    return 0;
}
 

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4
3
1 2 2
5
1 1 2 2 3
10
1 2 3 2 4 4 4 4 5 2
1
0