#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using vi = vector<int>;

#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define all(x) begin (x), end(x)
#define sz(x) (int) (x).size()
#define rep(i,a,b) for (int i = (a); i < (b); i++)

mt19937 rng(random_device{}());

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int n, x;
    cin >> n >> x;
    vi a(n);
    int ans = 0;
    rep(i,0,n) cin >> a[i];
    sort(a.begin(), a.end());
    rep(i,0,n){
        auto it = lower_bound(a.begin()+i, a.end(), x - a[i]);
        while(*it == x - a[i]){
            if(i == it - a.begin()) ans++;
            else ans += 2;
            it = lower_bound(it+1, a.end(), x - a[i]);
        }
    }
    cout << ans << endl;
}