#include <bits/stdc++.h>

using namespace std;

using ll = long long;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n, x;
    cin >> n >> x;
    vector<ll> cnt(100001, 0);
    for (int i = 0; i < n; i++) {
        int a;
        cin >> a;
        cnt[a]++;
    }

    ll ans = 0;
    for (int i = 0; i <= 100000; i++) {
        int tar = x - i;
        if (tar < 0 || tar > 100000) continue;
        ans += cnt[i] * cnt[tar];
    }
    cout << ans << endl;
    return 0;
}