#include <bits/stdc++.h>

using namespace std;

#define rep(i, n) for(int i = 0; i < (int)n; ++i)
#define FOR(i, a, b) for(int i = a; i < (int)b; ++i)
#define rrep(i, n) for(int i = ((int)n - 1); i >= 0; --i)

using ll = long long;
using ld = long double;

const int Inf = 1e9;
const double EPS = 1e-9;
const int MOD = 1e9 + 7;

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(0);
	int n, x;
	cin >> n >> x;
	vector<int> a(n);
	map<int, int> mp;
	rep (i, n) {
	  cin >> a[i];
	  mp[a[i]]++;
	}
	ll res = 0;
	rep (i, n) {
	  res += mp[x - a[i]];
	}
	cout << res << endl;

	return 0;
}