#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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