#include<iostream>
#include<map>
signed main(){
  int n,x;
  std::cin>>n>>x;
  std::map<int,int> mp;
  int64_t ans = 0;
  while(n--){
    int a;
    std::cin>>a;
    ans += mp[a^x];
    mp[a]++;
  }
  std::cout<< ans <<std::endl;
}