#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)(s); i < (int)(e); ++i)
#define all(a) (a).begin(),(a).end()

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    
    int N;
    ll X;
    cin >> N >> X;
    vector<ll> A(N), cnt(100010, 0);
    rep(i, 0, N) {
        cin >> A[i];
        ++cnt[A[i]];
    }
    
    ll ans = 0;
    rep(i, 0, N) {
        ll t = X - A[i];
        if (0 <= t && t < 100010) ans += cnt[t];
    }
    cout << ans << '\n';
}