/* -*- coding: utf-8 -*-
 *
 * 3297.cc:  No.3297 Bake Cookies - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_N = 200000;
const int MAX_M = 200000;

/* typedef */

using ll = long long;

/* global variables */

int as[MAX_M], cs[MAX_N];

/* subroutines */

bool check(int n, int t, int x) {
  ll rsum = 0;
  for (int i = 0; i < n; i++) {
    if (x >= cs[i]) rsum += (x - cs[i]) / t;
    else rsum -= (cs[i] - x);
  }
  return (rsum >= 0);
}

/* main */

int main() {
  int n, m, t;
  scanf("%d%d%d", &n, &m, &t);
  for (int i = 0; i < m; i++) scanf("%d", as + i), as[i]--;

  for (int i = 0; i < m; i++) cs[as[i]]++;

  int x0 = -1, x1 = *max_element(cs, cs + n);
  while (x0 + 1 < x1) {
    int x = (x0 + x1) / 2;
    if (check(n, t, x)) x1 = x;
    else x0 = x;
  }

  printf("%d\n", x1);
  
  return 0;
}