#include "bits/stdc++.h"
using namespace std;
#define  rep(i,s,t) for (auto i=s; i != t; ++i)
#define rrep(i,s,t) for (auto i=t; i-- != s;)
typedef long long ll;
constexpr auto inf = numeric_limits<ll>::max() / 2;
constexpr bool chmin(auto &a, auto const &x) { return a > x ? a = x, true : false; }
constexpr bool chmax(auto &a, auto const &x) { return a < x ? a = x, true : false; }
// constexpr auto ascii_lowercase = "qwertyuiopasdfghjklzxcvbnm"sv;

int main() {
  int N, M, T;
  cin >> N >> M >> T;
  vector<int> Cnt(N);
  while (M--) {
    int a;
    cin >> a;
    --a;
    Cnt[a] += 1;
  }

  auto f = [&](ll const t) -> bool {
    ll use=0;
    for (int const c : Cnt) {
      if (c <= t)
        use -= (t - c) / T;
      else
        use += c - t;
    }
    return use <= 0;
  };

  ll ok=inf, ng=0;
  while (ok - ng > 1) {
    ll const m = midpoint(ok, ng);
    if (f(m))
      ok = m;
    else
      ng = m;
  }

  cout << ok << endl;
}