#![allow(unused_imports)]
use std::cmp::*;
use std::collections::*;
use std::io::Write;
use std::ops::Bound::*;

#[allow(unused_macros)]
macro_rules! debug {
    ($($e:expr),*) => {
        #[cfg(debug_assertions)]
        $({
            let (e, mut err) = (stringify!($e), std::io::stderr());
            writeln!(err, "{} = {:?}", e, $e).unwrap()
        })*
    };
}

fn main() {
    let v = read_vec::<i64>();
    let (n, x) = (v[0] as usize, v[1]);
    let mut count = HashMap::new();
    for i in 0..n {
        let a = read::<i64>();
        *count.entry(a).or_insert(0) += 1;
    }
    if x == 0 {
        let ans = count.values().map(|&x| x * (x - 1) / 2).sum::<i64>();
        println!("{}", ans);
        return;
    }
    let mut ans = 0;
    for (&k, &v) in &count {
        if count.contains_key(&(k ^ x)) {
            ans += count[&(k ^ x)] * v;
        }
    }
    ans /= 2;
    println!("{}", ans);
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}