#include <bits/stdc++.h>

using namespace std;

int main() {
    int n, x;
    cin >> n >> x;
    int tezina[n];

    for (int i = 0; i < n; ++i) {
        cin >> tezina[i];
    }

    sort(tezina, tezina + n);

    int i = 0;
    int j = n - 1;
    int gondoli = 0;

    while (i <= j) {
        if (tezina[i] + tezina[j] <= x) {
            ++i;
        }
        --j;
        ++gondoli;
    }

    cout << gondoli << endl;

    return 0;
}