A

#include <bits/stdc++.h>

using namespace std;

#define _test   int _TEST; cin>>_TEST; while(_TEST--)

int main()
{
    _test
    {
        int n;
        cin>>n;

        vector<int> a(n);
        for(auto &e: a)     cin>>e;

        vector<int> b;

        int x = 1;

        for(int i=0; i<n; i++)
        {
            while(a[i] == x)        x++;
            b.push_back(x);
            x++;
        }

        cout<<b.back()<<"\n";
    }
}