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

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    ll N,M,T;
    cin>>N>>M>>T;
    vector<ll> A(N,0);
    for(ll i=0;i<M;i++){
        ll a;
        cin>>a;
        A[a-1]++;
    }
    sort(A.begin(),A.end());
    ll L=0,R=1e18;
    while(R-L>1){
        ll mid=(R+L)/2;
        ll z=0;
        ll d=0;
        for(int i=0;i<N;i++){
            if(A[i]<=mid){
                d+=(mid-A[i])/T;
            }
            else{
                z+=A[i]-mid;
            }
        }
        if(z<=d)R=mid;
        else L=mid;
    }
    cout<<R<<"\n";

}