#include<bits/stdc++.h>
using namespace std;
int t,n,k,a[110],m;
long long ans;
int main()
{
	scanf("%d",&t);
	while(t--)
	{
		ans=0;
		scanf("%d %d",&n,&k);
		for(int i=1;i<=n;++i)
		{
			scanf("%d",&a[i]);
			ans+=a[i]/k;
			a[i]=k-a[i]%k;
		}
		scanf("%d",&m);
		sort(a+1,a+1+n);
		for(int i=1;i<=n;++i)
		{
			if(m>=a[i])
			{
				++ans;
				m-=a[i];
			}
		}
		ans+=m/k;
		printf("%lld\n",ans);
	}
	return 0;
}