#include <cstdio>

int v[1010], a[1000010], n, k, m;

int main()
{
    freopen("pod.in","r",stdin);
    freopen("pod.out","w",stdout);
    scanf("%d %d %d",&n,&m,&k);
    int i, p, c, j, t;
    p=1;
    for (i=1; i<=m; i++) scanf ("%d",&v[i]);
    if (!n)
    {
        printf("1\n");
        return 0;
    }
    if (k==1)
    {
        if (!m) printf("1\n"); else printf("0\n");
        return 0;
    }
    if (k==1) k=0;
    c=1;
    p=1;
    a[0]=1;
    t=0;
    for (i=1; i<=n; i++)
    {
        if (i==v[c]) c++; else
        {
            a[p]=a[p-1];
            if (p>=k) a[p]+=a[p-k];
        }
        p++;
       /* if (p==23)
        {
            t=1;
            for (j=1; j<=22; j++) a[j]=a[j+1];
            p=22;
        }*/
    }
    printf("%d\n",a[p-1]);

}