#include <fstream>

using namespace std;

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

const int NMAX= 1000000;

int v[NMAX+5];

int main(  ) {
    int d, n, k, sol= 0;
    in >> d >> n >> k;
    for ( int i = 1;  i <= n;  ++i ) {
        in >> v[i];
    }

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

    out << sol << '\n';

    return 0;
}