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

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
 
    long long N,M,T; cin >> N >> M >> T;
    vector<long long> C(N);
    while(M--){
        int c; cin >> c;
        C.at(c-1)++;
    }

    long long low = -1,high = T*M+9;
    while(high-low > 1){
        long long mid = (high+low)/2;
        long long now = 0;
        for(auto c : C){
            long long over = c-mid;
            if(over <= 0) now -= abs(over)/T;
            else now += over;
        }

        if(now > 0) low = mid;
        else high = mid;
    }
    cout << high << endl;
}