#include <bits/stdc++.h>
//#include "atcoder/all"
typedef long long int ll;
using namespace std;
// using namespace atcoder;
#define MAXN 100001
ll a[MAXN];
ll cnt[MAXN];
int main() {
    ll n, x;
    cin >> n >> x;
    memset(cnt, 0, sizeof(cnt));
    for (int i = 1; i <= n; i++) {
        ll ax;
        cin >> ax;
        a[i] = ax;
        cnt[ax]++;
    }
    ll ret = 0;
    for (int i = 1; i <= n; i++) {
        ret += cnt[x - a[i]];
    }
    cout << ret << endl;
    return 0;
}