// map + citire stdio
#include <stdio.h>
#include <map>
#include <algorithm>
using namespace std;
#define nmax 1030
#define p 666013
long n, s, i, v[nmax], j, rez, poz, a, b, ra, rb;
map <int, int> ma1[p+10];
 
void citire()
{
    scanf("%ld %ld",&n,&s);
    for (i=1;i<=n;i++)
        scanf("%ld",&v[i]);
}
 
void rezolvare()
{
    ma1[(v[1]+v[2])%p][v[1]+v[2]]++;
    for (poz=3;poz<=n-1;poz++)
    {
        for (i=poz+1;i<=n;i++)
            if (s>v[poz]+v[i])
                rez+=ma1[(s-v[poz]-v[i])%p][s-v[poz]-v[i]];
        for (i=1;i<=poz-1;i++)
            ma1[(v[i]+v[poz])%p][v[i]+v[poz]]++;
    }
    printf("%ld",rez);
}
 
int main()
{
    freopen("oite.in","r",stdin);
    freopen("oite.out","w",stdout);
    citire();
    sort(v+1,v+1+n);
    rezolvare();
    return 0;
}