#include <bits/stdc++.h>
using namespace std;
#define int long long
void solve()
{
	int n, k;
	cin >> n >> k;
	vector<int> a;
	int ans = 0;
	for(int i = 0; i < n; ++i) {
		int x;
		cin >> x;
		a.emplace_back((x / k + 1) * k - x);
		ans += x / k;
	}
	int m;
	cin >> m;
	sort(a.begin(), a.end());
	for(auto &c : a) {
		if(m >= c) {
			++ans;
			m -= c;	
		}
	}
	ans += m / k;
	cout << ans << '\n';
}

signed main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int T = 1;
	cin >> T;
	while(T--) solve();
	return 0;
}