#include<iostream>
#include<cstdio>
#include<cstring>
#include <cstdlib>  
#include <cmath>   
#include<cctype>
#include<string>
#include<set>
#include <map>
#include<algorithm>
#include <functional>
#include<vector>
#include<climits>
#include<stack>
#include<queue>
#include <deque>
#include <climits>
#include <typeinfo>
#include <utility> 
#define all(x) (x).begin(),(x).end()
#define rep(i,m,n) for(int i = m;i < n;++i)
#define pb push_back
#define rrep(i,m,n) for(int i = m;i >= n;--i)
#define INF INT_MAX-1;
using namespace std;
using ll = long long;
using R = double;
const ll inf = 1LL << 50;
const ll MOD = 1e9 + 7;
struct edge { ll from; ll to; ll cost; };





int main(){
	ll n, x;
	cin >> n >> x;

	vector<ll>a(n);
	a.push_back(-inf);
	rep(i, 0, n)cin >> a[i];
	a.push_back(inf);
	sort(all(a));

	ll ans = 0;
	rep(i, 1, n+1) {
		ll temp1, temp2;
		//x-a[i]以下の個数
		temp1 = upper_bound(all(a), x - a[i]) - a.begin();
		//x-a[i]未満の個数
		temp2 = lower_bound(all(a), x - a[i]) - a.begin();
		ans += temp1 - temp2;
	}
	cout << ans << endl;

	return 0;
}