import java.util.Scanner;

public class No723 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String nx = sc.nextLine();
		String[] nxArr = nx.split(" ");
		int N = Integer.parseInt(nxArr[0]);
		int X = Integer.parseInt(nxArr[1]);

		int a[]=new int[100000];
		int t[] = new int[100001];
		int i;
		for(i=0;i<N;i++) {
			a[i]=sc.nextInt();
			t[a[i]]++;
		}
		sc.close();
		long s=0;
		for(i=0;i<N;i++) {
			if(X-a[i]>=0 && 100000 >= X-a[i]) {
				s +=t[X-a[i]];
			}
		}
		System.out.println(s);

	}

}