#[macro_export]
macro_rules! setup {
    { mut $input:ident: SplitWhitespace $(,)? } => {
        use std::io::Read;
        let mut buf = String::new();
        std::io::stdin().read_to_string(&mut buf).ok();
        let mut $input = buf.split_whitespace();
    };
}

#[macro_export]
macro_rules! parse_next {
    ($str_iter:expr) => {
        $str_iter.next().unwrap().parse().ok().unwrap()
    };
}

fn main() {
    setup! { mut input: SplitWhitespace };

    let n: usize = parse_next!(input);
    let x: usize = parse_next!(input);
    let a: Vec<usize> = (0..n).map(|_| parse_next!(input)).collect();

    let mut c = std::collections::HashMap::new();
    for i in 0..n {
        let key = x ^ a[i];
        if let Some(value) = c.get_mut(&key) {
            *value += 1;
        } else {
            c.insert(key, 1);
        }
    }

    let ans = (|| {
        let mut count = 0;
        for i in 0..n {
            if let Some(value) = c.get(&a[i]) {
                count += *value;
            }
        }
        if x == 0 {
            count -= n;
        }
        count / 2
    })();

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