#include <iostream>
#include <fstream>

using namespace std;

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

const int NMAX = 1000000 + 1;
int n, d, k;
int v[NMAX];

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

void rezolva() {
    int x = 1, sol = 0;
    for (int i = 2; i <= n; i++)
        if (v[i] - v[x] >= d)  {
            sol = sol + min(i - x, k);
            x = i;
        }
    sol = sol + min(n - x, k);
    g << sol << '\n';
}

int main() {
    citeste();
    rezolva();
    return 0;
}