#include<iostream>
#include<vector>
#include<map>
#include<algorithm>

using namespace std;

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

  int ans = 0;

  for(int i=0;i < n;i++){
    if(x-a[i] >= 0 && x-a[i] < 100005)ans += c[x - a[i]];
  }
  cout << ans << endl;
  return 0;
}