#include<iostream>
#include<unordered_map>
#include<tuple>

int main() {
    int N, X;
    std::cin >> N >> X;
    
    std::unordered_map<int, long> A;
    
    long ans = 0;
    
    if (X == 0) {
        ans -= N;
    }
    
    for (int i = 0; i < N; i++) {
        int a;
        std::cin >> a;
        A[a] += 1;
    }
    
    
    for (auto a:A) {
        ans += A[a.first ^ X] * a.second;
    }
    
    std::cout << ans / 2 << std::endl;
}