include<bits/stdc++.h>

using namespace std;
long long n,a[100000],f[100000],k,d;
map<long long,long long>mp;
int main()
{
cin>>n>>k;
for(int i=1;i<=n;i++)
{
cin>>a[i];
a[i-1]=k-a[i];
{
if (mp.count(k-a[i]))
d=d+mp[k-a[i]];
}
mp[a[i]]++;
}

    cout<<d;

}