#include<bits/stdc++.h>
using namespace std;

int main(){
  using ll=long long;
  ll n,m,t;
  cin>>n>>m>>t;
  vector<int> a(m);
  vector<ll> c(n);
  for (int i=0;i<m;i++){
    cin>>a[i];
    a[i]--;
    c[a[i]]++;
  }
  ll l=0,r=1e18;
  while (r-l>1){
    ll mid=(l+r)/2;
    ll cnt=0;
    ll rest=0;
    for (int i=0;i<n;i++){
      cnt+=(mid-min(mid,c[i]))/t;
      rest+=c[i]-min(mid,c[i]);
    }
    if (rest<=cnt) r=mid;
    else l=mid;
  }
  cout<<r<<endl;
}