#include <bits/stdc++.h>

#define endl "\n"
using namespace std;
using ll = long long;
using ld = long double;
using pii = pair<int, int>;

constexpr int N = 1e5+5;

int n, ans = 0, s, f, z;
vector<int> vec;

void Solve()
{
  cin >> n >> z;
  for (int i = 0, v; i < n; i++)
    cin >> v, vec.push_back(v);
  sort(vec.begin(), vec.end());
  s = (n-1)/2, f = n-1;
  for (; s >= 0 && f > (n-1)/2 ; ans+= (s >= 0 && f > (n-1)/2), f--, s--)
    while (s>=0&&(vec[f]-vec[s])<z)
      s--;
  cout << ans;
}

int main()
{
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  cout.tie(nullptr);
  Solve();
  return 0;
}