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

bool calc(long long num, const vector<long long>& 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<long long> mem(N, 0);

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

    left = -1;
    right = 1e18;
    while (left + 1 < right) {
        mid = left + (right - left) / 2;
        if (calc(mid, mem, N, T)) {
            right = mid;
        }
        else {
            left = mid;
        }
    }

    cout << right << endl;
    return 0;

}

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

}