#include<bits/stdc++.h>
using namespace std;
const int N=1e5+10;
int T,n,k,a[N],m;
int main() {
    scanf("%d",&T);
    while(T--) {
        scanf("%d%d",&n,&k);
        long long ans=0;
        for(int i=1;i<=n;i++) {
            scanf("%d",&a[i]);
            int x=a[i]/k;
            ans+=x,a[i]=(x+1)*k-a[i];
        }
        scanf("%d",&m);
        sort(a+1,a+n+1);
        for(int i=1;i<=n;i++)if(a[i]<=m)m-=a[i],ans++;
        ans+=m/k;
        printf("%lld\n",ans);
    }
}