#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

int cnt[100005];

int main() {
  int n, x;
  cin >> n >> x;
  vector<int> a(n);
  for (int i = 0; i < n; ++i) cin >> a[i];
  for (int i = 0; i < n; ++i) cnt[a[i]]++;


  ll ans = 0;
  for (int i = 0; i < n; ++i) {
    int d = x - a[i];
    if (d >= 0 && d <= 100000) ans += cnt[d];
  }
  cout << ans << endl;
  return 0;
}