#include <bits/stdc++.h>

using i64 = long long;
using u64 = unsigned long long;
using u32 = unsigned;

void solve() {
    int n, k;
    std::cin >> n >> k;
    
    std::vector<int> a(n);
    i64 ans = 0;
    for (int i = 0; i < n; i++) {
        std::cin >> a[i];
        ans += a[i] / k;
        a[i] = k - a[i] % k;
    }
    int m;
    std::cin >> m;
    std::sort(a.begin(), a.end());
    for (auto x : a) {
        if (m >= x) {
            m -= x;
            ans++;
        }
    }
    ans += m / k;
    std::cout << ans << "\n";
}

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    
    int t;
    std::cin >> t;
    
    while (t--) {
        solve();
    }
    
    return 0;
}