#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
int N, X, a[1 << 17];
long long ans = 0, cnt[1 << 17];
signed main() {
  cin.tie(0)->sync_with_stdio(0);
  cin >> N >> X;
  rep(i, N) {
    cin >> a[i];
    ++cnt[a[i]];
  }
  rep(i, N) {
    int tgt = X - a[i];
    if (0 <= tgt && tgt < 1 << 17) ans += cnt[tgt];
  }
  cout << ans << endl;
}