#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int maxn = 1e6;
int main() {
  ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  int n, m, k;
  cin >> n >> m >> k;
  vector<int> a(maxn, 0);
  for (int i = 0; i < n; i++) {
    int x;
    cin >> x;
    x--;
    a[x] = 1;
  }
  int ans = 0;
  int cur = 0;
  for (int i = 0; i < maxn; i++) {
    cur += a[i];
    if (i >= m) cur -= a[i - m];
    if (cur == k) ans++, cur--, a[i] = 0;
  }
  cout << ans;
}
