#include <bits/stdc++.h>
#define _for(i, a, b) for(int i = (a); i <= (b); i++)
#define int long long
#define pb push_back
#define LL long long
#define endl "\n"

const int N = 2e6 + 10;
const int INF = 1e10;

using namespace std;

int a[N], b[N], n, m, k;

inline bool check(int haha) {

	int sum = 0;

	for (register int i = 1; i <= (n + 1) / 2; i ++ ) {

		if(a[i] <= haha) continue;

		int tmp = ceil(1.0 * (a[i] + 1) / (haha + 1));

		sum += b[tmp];

	}

	if(sum <= k) return true;

	return false;

}

inline bool t_check() {

	int sum = 0;

	for (register int i = 1; i <= (n + 1) / 2; i ++ ) {

		sum += b[a[i] + 1];

	}

	if(sum <= k) return true;

	return false;

}

void solve(){

	std::cin >> n >> m >> k;

	for (register int i = 1; i <= n; i ++ ) {

		std::cin >> a[i];

	}

	std::sort(a + 1, a + n + 1);

    for (register int i = 0; i <= m * 2; i ++ ) b[i] = INF;

	for (register int i = 1; i <= m; i ++ ) {

		std::cin >> b[i];

	}

	for (register int i = m; i >= 1; i -- ) b[i] = std::min(b[i], b[i + 1]);

	for (register int i = 2; i <= m; i ++ ) {

		for (register int j = i; j < m * 2 + i; j += i ) {

			b[j] = std::min(b[j], b[j / i] + b[i]);

		}

	}
	for (register int i = 2 * m; i >= 1; i -- ) {

		b[i] = std::min(b[i], b[i + 1]);

	}

	int l = 1, r = m;

	while(l < r) {

		int mid = (l + r) / 2;

		if(check(mid)) r = mid;

		else l = mid + 1;

	}

	if(t_check()) l = 0;

	std::cout << l << '\n';

}
signed main() {

	std::ios::sync_with_stdio(false);

	std::cin.tie(0);

	int T;

	T = 1;

	std::cin >> T;

	while(T --) {

		solve();

	}

	return 0;

}