use std::collections::HashMap;

//TODO
fn main() {
    let mut nx = String::new();
    std::io::stdin().read_line(&mut nx).ok();
    let nx: Vec<usize> = nx.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nx[0];
    let x = nx[1];

    let mut mapping: HashMap<usize, usize> = HashMap::new();
    for _ in 0..n {
        let mut a = String::new();
        std::io::stdin().read_line(&mut a).ok();
        let a: usize = a.trim().parse().unwrap();
        if let Some(b) = mapping.get_mut(&a) {
            *b += 1;
        } else {
            mapping.insert(a, 1);
        }
    }
    let mut result: usize = 0;
    mapping.iter().for_each(|pair| {
        let b = pair.0 ^ x;
        if x != 2 {
            result += pair.1 * mapping.get(&b).unwrap_or(&0usize);
        } else {
            result += pair.1 * (pair.1 - 1);
        }
    });
    if x != 0 {
      result /= 2;
    }
    println!("{}", result);
}