#include<stdio.h>
#include<vector>

using namespace std;

#define ll long long
#define MOD 666013
#define x first
#define y second
#define PII pair<int, int>

vector<PII > h[666021];

int n,s,v[1050];
ll sol;

PII *find(int val)
{
    if (val < 0)
        return 0;
    int i,key=val%MOD;
    int nr=h[key].size();
    for(i=0;i<nr;i++)
        if(h[key][i].x==val)
            return &h[key][i];
    return 0;
}

void update(int val)
{
    if (val < 0)
        return ;
    PII *a = find(val);
    if (a != NULL)
        a->y++;
    else
        h[val%MOD].push_back( make_pair(val, 1) );
}

int main ()
{
    int i,j;
    PII *a;
    
    freopen("oite.in","r",stdin);
    freopen("oite.out","w",stdout);
    scanf("%d%d",&n,&s);
    for(i=1;i<=n;i++)
        scanf("%d",&v[i]);
    for(i=1;i<=n;i++)
    {
        for(j=i+1;j<=n;j++)
        {
            a = find(s-v[i]-v[j]);
            if (a)
                sol += a->y;
        }
        for(j=1;j<i;j++)
            update(v[i]+v[j]);
    }
    printf("%lld\n",sol);
    
    return 0;
}