#include <fstream>

using namespace std;
int v[1000005];
int main()
{
	ifstream cin("zombie.in");
	ofstream cout("zombie.out");

    int n,d,k,nr,cnt=0,s=0,a;
    cin>>d>>n>>k;
    nr=0;

    for(int i=0;i<n;i++)
	{
		cin>>v[i];
	}

	for(int i=0;i<n;i++)
	{
		if(v[i]>v[nr]+d)
		{
			if(cnt>k)
				s+=k;
			else
				s+=cnt;
			cnt=1;
			nr=i;
		}
		if(v[i]<=v[nr]+d)
			cnt++;
	}
	if(cnt>k)
		s+=k;
	else
		s+=cnt;
	cnt=0;
	nr+=d;

	cout<<s;


    return 0;
}