#include<bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int i = 0; i < (int)(n); i++)

int main(){
  long long N, M, T, A;
  cin >> N >> M >> T;
  vector<long long> v(N);
  rep(i, M){
    cin >> A;
    v[--A]++;
  }
  long long ng = 0, ok = 1234567, mi, cnt;
  while(ok - ng > 1){
    mi = (ok + ng) / 2;
    cnt = 0;
    rep(i, N){
      if(v[i] > mi)cnt += v[i] - mi;
      else cnt -= (mi - v[i]) / T;
    }
    if(cnt <= 0)ok = mi;
    else ng = mi;
  }
  cout << ok << endl;
}