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

void solve() {
	int n; cin >> n;
	int ans = 0;
	for (int i = 0; i < n; i++) {
		int a; cin >> a;
		if (a == 1) ans++;
	}
	cout << (n - ans + 1) % (n + 1) << endl;
}

int main() {
	int t; cin >> t;
	while (t--) solve();
	return 0;
}