import java.util.Scanner;
// import java.util.List;
// import java.util.ArrayList;

class Main {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
//         List<Integer> a = new ArrayList<Integer>();
        int count = 0, N, X;
        N = sc.nextInt();
        X = sc.nextInt();
        int[] a = new int[N];

        for (int i = 0; i < N; i++) {
            a[i] = sc.nextInt();
        }

        for (Integer i : a) {
            for (Integer j: a) {
                if (i+j == X) {
                    count++;
                }
            }
        }
        System.out.println(count);
    }
}