#include <bits/stdc++.h>

using namespace std;

using ll = long long;

const int N = 100005;

int n, c, a[N];

int main() {
    ios::sync_with_stdio(false); cout.tie(nullptr); cin.tie(nullptr);
    cin >> n >> c;
    for (int i = 0; i < n; ++i)
        cin >> a[i];
    sort(a, a + n);
    int i = 0, j = n - 1, ans = 0;
    while (i <= j) {
        if (a[i] + a[j] > c) {
            --j; ++ans;
            continue;
        }
        ++i; --j; ++ans;
    }
    cout << ans << '\n';
    return 0;
}