#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios::sync_with_stdio(false); cin.tie(0);
  int n, x;
  cin >> n >> x;
  map<int, int> mp;
  long long ans = 0;
  for (int i = 0; i < n; i++) {
    int in;
    cin >> in;
    mp[in]++;
    if (!mp.count(x - in)) continue;
    ans += mp[x - in] * 2 + (in + in == x ? -1 : 0);
  }
  cout << ans << endl;
  return 0;
}