#include <iostream>
#include <vector>
#include <string>
#include <cmath>
using namespace std;

bool calc(long long num, const vector<int>& A, long long N, long long T);

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

    long long a, N, M, T, i=0, left, right, mid;
    cin >> N >> M >> T;
    vector<int> A;
    vector<int> mem;
    for (i = 0; i < N; i++) {
        mem.push_back(0);
    }

    for (i = 0; i < M; i++) {
        cin >> a;
        A.push_back(a);
        A[a - 1] += 1;
    }

    left = 0;
    right = pow(10, 18) + 10;
    while (left + 1 < right) {
        mid = (left + right) / 2;
        if (calc(mid, A, N, T)) {
            right = mid;
        }
        else {
            left = mid;
        }
    }

    cout << left << endl;

}

bool calc(long long num, const vector<int>& A, long long N, long long T) {
    long long p = 0, q = 0;
    for (int i = 0; i < N; i++) {
        if (A[i] <= num) {
            p += (num - A[i]) / T;
        }
        else {
            q += A[i] - num;
        }
    }
    
    if (q <= p) {
        return true;
    }
    else {
        return false;
    }

}