#include <cstdio>
#include <algorithm>

#define NMAX 1000007

using namespace std;

int a[NMAX];
int d, n, k;

int main(){
    freopen("zombie.in", "r", stdin);
    freopen("zombie.out", "w", stdout);
    scanf("%d %d %d", &d, &n, &k);
    for(int i = 1; i <= n; ++i)
        scanf("%d", &a[i]);
    int poz = 1, Ans = 0;
    for(int i = 2; i <= n; ++i)
        if(a[i] - a[poz] >= d){
            Ans += min(k, i - poz);
            poz = i;
        }
    Ans += min(n - poz, k);
    printf("%d\n", Ans);
    return 0;
}