#include<bits/stdc++.h>
#define int long long
#define endl '\n'
using namespace std;
void solve()
{
    int n,k;
    cin>>n>>k;
    vector<int>a(n+1);
    vector<pair<int,int>> tmp;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
        tmp.push_back({k-a[i]%k,i});
    }
    sort(tmp.begin(),tmp.end());
    int m;
    cin>>m;
    for(auto [x,y]:tmp)
    {
        // cout<<x<<' '<<y<<endl;
        if(x<=m)
        {
            m-=x;
            a[y]+=x;
        }
        else
        {
            a[y]+=m;
            m=0;
            break;
        }
    }
    int ans=0;
    for(int i=1;i<=n;i++)
    {
        ans+=a[i]/k;
    }
    ans+=m/k;
    cout<<ans<<endl;
}
signed main()
{   
    cin.tie(0)->sync_with_stdio(0);
    int t=1;
    cin>>t;
    while(t--) solve();
    return 0;
}