#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
int gcd(int a,int b){return b?gcd(b,a%b):a;}

ll a[100001];

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll n,b;
    ll x;
    ll c=0;
    cin >> n >> x;
    rep(i,n) {
        cin >> b;
        a[b]++;
    }
    rep(i,x+1) {
        if (i>100000) break;
        if (a[i]!=0) {
            if (x-i<=100000 && a[x-i]>0) {
                c+=a[x-i]*a[i];
            }
        }
    }
    cout << c << endl;
    return 0;
}