use std::collections::HashMap;

fn main() {
    let (n, x): (usize, u32) = {
        let mut buf = String::new();
        std::io::stdin().read_line(&mut buf).unwrap();
        let mut iter = buf.split_whitespace();
        (
            iter.next().unwrap().parse().unwrap(),
            iter.next().unwrap().parse().unwrap(),
        )
    };

    let mut map: HashMap<u32, u64> = HashMap::new();
    let mut ans: u64 = 0;
    for _ in 0..n {
        let a : u32 = {
            let mut buf = String::new();
            std::io::stdin().read_line(&mut buf).unwrap();
            buf.trim_end().parse().unwrap()
        };

        ans += *map.entry(a ^ x).or_insert(0);
        
        *map.entry(a).or_insert(0) += 1;
    }

    println!("{}", ans);
}