#include <bits/stdc++.h> 
 
using namespace std;  
 
typedef long long ll;  
typedef pair<int, int> ii;  
 
const int INF = 1e9;  
const ll LINF = 1e18;  
 
const int N = 2e5 + 5; 
 
int n, x;  
int a[N]; 
 
int main() {
	ios::sync_with_stdio(false); 
	cin.tie(nullptr); 	
	cin >> n >> x; 
	for (int i = 1; i <= n; i++) cin >> a[i]; 
 
	sort(a + 1, a + n + 1); 
 
	int ans = 0;  
	int l = 1, r = n;  
	while (l <= r) {
		if (a[l] + a[r] <= x) l++; 
		r--; 
		ans++; 
	}
 
	cout << ans << '\n'; 
}

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NCAxMAo3IDIgMyA5

4 10
7 2 3 9