#include <cstdio>
#include <deque>
#define pb push_back
using namespace std;
deque <int> bst,val;
int main()
{
	int i,j,n,k,d,last=0,x;
	
	freopen("zombie.in","r",stdin);
	freopen("zombie.out","w",stdout);
	scanf("%d %d %d %d",&d,&n,&k,&x);
	bst.pb(1);val.pb(x);
	for (i=2;i<=n;++i) 
	{scanf("%d",&x);
	 while ((!val.empty()) && (val.front()<=x-d) )
		 last=bst.front(),val.pop_front(),bst.pop_front();
	 val.pb(x);
	 bst.pb(min(bst.back()+1,last+k));
	}
	printf("%d\n",bst.back());
return 0;
}