#include <cstdio>

using namespace std;
int a[500001],n,k,b,i,j,t,s,c;
int main()
{
    freopen("divk.in","r",stdin);
    freopen("divk.out","w",stdout);
    scanf("%d%d%d%d",&n,&k,&c,&b);
    for(i=1;i<=n;i++)
        scanf("%d",&a[i]);
    for(i=1;i<=n-c+1;i++)
    {
        s=0;
        for(j=i;(j<=i+b)&&(j<=n);j++)
        {
            s=s+a[j];
            if((s%k==0)&&(j-i+1>=c))
                t++;
        }
    }
    printf("%d",t);
    return 0;
}