# include <iostream>
# include <cstdio>
# include <queue>
# include <vector>
# include <stack>
# include <map>
# include <cmath>
# include <algorithm>
# include <stdio.h>
using namespace std;

int br[100005];
//int a[100005];
int main()
{
freopen ("xor.out","w",stdout);
freopen ("xor.in","r",stdin);
int n,k;
int i,x;
long long t;
scanf("%d%d",&n,&k);
long long s=0;
for(i=1;i<=n;i++)
{
    scanf("%d",&x);
    t=k^x;
    if(t<=100000)
     s=s+br[t];
    br[x]++;
}

/*for(i=1;i<=n;i++)
{

    //cout<<(k^a[i])<<endl;
    if((k^a[i])==a[i])s--;
}*/
printf("%lld\n",s);
return 0;
}