import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    int x = sc.nextInt();
    int[] a = new int[n];
    int[] num = new int[100001];
    for(int i = 0; i < n; i++) {
      int t = sc.nextInt();
      a[i] = t;
      num[t]++;
    }
    long ans = 0;
    for(int i = 0; i < n; i++) {
      if(((x - a[i]) >= 0) && ((x - a[i]) <= 100000)) ans += num[x - a[i]];
    }
    System.out.println(ans);
  }
}