#include <fstream>

using namespace std;
ifstream fin("zombie.in");
ofstream fout("zombie.out");
int v[1000005];

int main()
{
    int d,n,k,a,st=0,dr=0,cnt=0,s=0,i;
    fin>>d>>n>>k;
    fin>>v[0];
    st=v[0];
    dr=v[0];
    cnt=1;
    for(i=1; i<n; i++)
    {
        fin>>v[i];
        if(v[i]-st>d-1)
        {
            if(cnt<k)
                s+=cnt;
            else
                s+=k;
            cnt=1;
            st=v[i];
            dr=v[i];
        }
        else
        {
            cnt++;
            dr=v[i];
        }
    }
    if(cnt<k)
        s+=cnt;
    else
        s+=k;
    fout<<s;
    return 0;
}