#include <bits/stdc++.h>
using namespace std;

int main() {
  int N, X;
  cin >> N >> X;
  vector<int> A(N);
  for (int i = 0; i < N; i++) cin >> A.at(i);
  map<int, int> MA;
  for (auto a : A) MA[a]++;
  long ans = 0;
  for (auto a : A) ans += MA[X - a];
  cout << ans << "\n";
}