#include <fstream>

using namespace std;

ifstream f("zombie.in");
ofstream g("zombie.out");

int d, n, k;
int v[1000001];

int main()
{
    f >> d >> n >> k;
    for (int i=1; i<=n; i++)
        f >> v[i];

    int rez = 0, peStrada = 1, p = v[1];
    for (int i=2; i<=n; i++)
    {
        if (v[i] - p > d)
        {
            rez += min(peStrada, k);
            peStrada = 0;
            p = v[i];
        }
        peStrada++;
    }
    rez += min(peStrada, k);

    g << rez;

    return 0;
}