#![allow(unused_imports)]
#![allow(non_snake_case)]
use std::collections::HashMap;
use std::collections::HashSet;
use std::collections::VecDeque;

#[allow(unused_macros)]
macro_rules! read {
    ([$t:ty] ; $n:expr) =>
        ((0..$n).map(|_| read!([$t])).collect::<Vec<_>>());
    ($($t:ty),+ ; $n:expr) =>
        ((0..$n).map(|_| read!($($t),+)).collect::<Vec<_>>());
    ([$t:ty]) =>
        (rl().split_whitespace().map(|w| w.parse().unwrap()).collect::<Vec<$t>>());
    ($t:ty) =>
        (rl().parse::<$t>().unwrap());
    ($($t:ty),*) => {{
        let buf = rl();
        let mut w = buf.split_whitespace();
        ($(w.next().unwrap().parse::<$t>().unwrap()),*)
    }};
}

#[allow(dead_code)]
fn rl() -> String {
    let mut buf = String::new();
    std::io::stdin().read_line(&mut buf).unwrap();
    buf.trim_end().to_owned()
}

const A_MAX: usize = 100000;
fn main() {
    
    let (_, x) = read!(usize, usize);
    let a = read!([usize]);

    let mut v = vec![0u32; A_MAX+1];
    let mut ans = 0u64;
    for &e in &a {
        if e > x {
            continue;
        } else {
            if x == e + e {
                ans += 1;
            }
            // assert!(x >= e);
            if (x - e) < 100001 {
                ans += v[x - e] as u64 * 2;
                v[e] += 1;
            }
        }
    }
    println!("{}", ans);
}