#include <fstream>

using namespace std;

ifstream fin("zombie.in");
ofstream fout("zombie.out");

int D, N, K, solution, x;
int A[1000001];

int main()
{
    fin >> D >> N >> K;

    for(int i = 1; i <= N ;i ++)
    {
        fin >> x;
        A[x / D] ++;
    }

    for(int i = 0;i <= x / D; i ++)
    {
        if(A[i] > K)
        {
            solution += K;
        }
        else
            solution += A[i];
    }

    fout << solution;

    return 0;
}