#include <iostream>
#include <vector>

int main() {
    int n, x, s = 0;
    std::cin >> n >> x;
    if (n == 1) { std::cout << x; return 0; }
    std::vector<int> a(n);
    for (int i = 0; i < n - 1; ++i) {
        a[i] = i + 1;
        s ^= a[i];
    }
    int last = s ^ x;
    bool conflict = false;
    if (last == 0) conflict = true;
    else if (last < n) conflict = true;

    if (conflict) {
        a[0] ^= 1 << 18;
        a[1] ^= 1 << 19;
        last ^= (1 << 18) | (1 << 19);
    }
    for (int i = 0; i < n - 1; ++i) std::cout << a[i] << " ";
    std::cout << last << std::endl;
    return 0;
}