#include<bits/stdc++.h>
using namespace std;
typedef long ll;
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int t;
	cin>>t;
	while(t--)
	{
		int n,ans=0;
		cin>>n;
		vector<ll>v;
		for(int i=0;i<n;i++)
		{
			int x;
			cin>>x;
			v.push_back(x);
		}
		sort(v.begin(),v.end());
		ll k;
		cin>>k;
		for(int i=0;i+1<n;i++)
		{
			for(int j=i+1;j<n;j++)
			{
				ll s=v[i]+v[j];
			            ans+=v.end()-upper_bound(v.begin()+j+1,v.end(),k-s);
			}
		}
		cout<<ans<<endl;
	}
	return 0;
}

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MQoxMAoxIDIgMyA0IDUgNiA3IDggOSAxMAoyMw==

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