#include<fstream>
#include<algorithm>
using namespace std;
int a[1000004],i,j,k,n,sol,d,p;
int main()
{

    ifstream cin("zombie.in");
    ofstream cout("zombie.out");
    cin>>d>>n>>k;
    for(i=1;i<=n;i++)
    {
        cin>>a[i];

    }
    p=1;
    for(i=2;i<=n;i++)
       if(a[i]-a[p]>=d){
            sol+=min(i-p,k);
            p=i;
       }
    sol+=min(i-p,k);
    cout<<sol;
    return 0;

}