#include<cstdio>
#include<vector>
using namespace std;
const int mod=7919;
int v[1100];
vector<int>g[mod];

inline int find_num(int nr)
{
    vector<int>::iterator it;
    int x=nr%mod,cnt=0;
    for(it=g[x].begin();it!=g[x].end();++it)
        if(*it==nr)
            cnt++;
    return cnt;
}
inline void add_num(int nr)
{
    int x=nr%mod;
    g[x].push_back(nr);
}

int main()
{
    freopen("oite.in","r",stdin);
    freopen("oite.out","w",stdout);
    int n,i,j,s,sol=0,normsum;
    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++)
        {
            normsum=s-v[i]-v[j];
            if(normsum>=0)
                sol+=find_num(normsum);
        }
        for(j=1;j<i;j++)
            add_num(v[i]+v[j]);
    }
    printf("%d",sol);
}