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[] result = new int[n];
        int mod = n % 4;
        if (mod == 0) {
            n--;
            result[n] = x;
            n--;
            result[n] = 1;
            n--;
            result[n] = 100005;
            n--;
            result[n] = 100004;
        } else if (mod == 1) {
            n--;
            result[n] = x;
        } else if (mod == 2) {
            n--;
            result[n] = x ^ 1;
            n--;
            result[n] = 1;
        } else {
            n--;
            result[n] = x ^ 1;
            n--;
            result[n] = 100005;
            n--;
            result[n] = 100004;
        }
        int idx = 2;
        while (n > 0) {
            if (idx == x || idx + 1 == x || idx == (x ^ 1) || idx + 1 == (x ^ 1)) {
                idx += 2;
                continue;
            }
            n--;
            result[n] = idx;
            idx++;
            n--;
            result[n] = idx;
            idx++;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < result.length; i++) {
            sb.append(result[i]).append("\n");
        }
        System.out.print(sb);
    }
}