#include <bits/stdc++.h>
#define REP(i, m, n) for(int i = (int)(m); i < (int)(n); ++i)
#define rep(i, n) REP(i, 0, n)
using namespace std;
using ll = long long;
using ld = long double;
template<class T, class U> inline bool chmax(T &a, const U &b) { if(a < b) { a = b; return true; } return false; }
template<class T, class U> inline bool chmin(T &a, const U &b) { if(a > b) { a = b; return true; } return false; }

int n, x, a[100000];

int main() {
  cin.tie(0); ios::sync_with_stdio(false);
  cin >> n >> x;
  rep(i, n) cin >> a[i];
  map<int, int> cnt;
  rep(i, n) {
    cnt[x-a[i]]++;
  }
  ll ans = 0;
  rep(i, n) {
    ans += cnt[a[i]];
  }
  cout << ans << '\n';
  return 0;
}