#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
#define int long long
using namespace std;
typedef pair<int, int> P;
const int INF = 1e15;

int d[100010];

signed main(){
    int n, x;
    cin >> n >> x;
    vector<int> a(n);
    rep(i, 0, n){
        cin >> a[i];
        d[a[i]]++;
    }
    int ans = 0;
    rep(i, 0, n){
        int tmp = x - a[i];
        if(0 <= tmp && tmp <= 100000){
            ans += d[tmp];
        }
    }
    cout << ans << endl;
}