#include <bits/stdc++.h>
#define int long long
#define MAX 1030
using namespace std;
int n,x,v[MAX],cnt;
unordered_map<int, int> mp;

ifstream fin("oite.in");
ofstream fout("oite.out");

signed main()
{
    fin >> n >> x;
    for(int i = 1; i <= n; i++){
        fin >> v[i];
    }
    for(int i = 1; i <= n; i++){
        for(int j = i+1; j <= n; j++){
            int rest = x-v[i]-v[j];
            if(mp.count(rest)){
                cnt += mp[rest];
            }
        }
        for(int j = i-1; j >= 1; j--){
            mp[v[i]+v[j]]++;
        }
    }
    fout << cnt;
    return 0;
}