#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main(void){
  int N, X;
  cin >> N >> X;
  if(X > 200000){
    cout << 0 << endl;
    return 0;
  }
  vector<int> a(N);
  for(int i = 0; i < N; i++){
    cin >> a[i];

  }
  vector<long> S(200001, 0);
  for(int i = 0; i < N; S[a[i]]++, i++) {}
  long ans = 0;
  for(int i = 0; i < N; i++){
    if(a[i] > X){
      continue;

    }
    if(a[i] == X - a[i]){
      ans += S[a[i]] * S[a[i]];
      S[a[i]] = 0;

    }else{
      ans += 2 * S[a[i]] * S[X-a[i]];
      S[a[i]] = 0;
      S[X - a[i]] = 0;

    }
  }
  cout << ans << endl;
  return 0;

}