#include <cstdio>

using namespace std;
int nr,n,k,a,b,x,s[500005],i,j;
int main()
{
    freopen("divk.in","r",stdin);
    freopen("divk.out","w",stdout);
    scanf("%d%d%d%d",&n,&k,&a,&b);
    for(i=1;i<=n;i++)
    {
        scanf("%d",&x);
        s[i]=s[i-1]+x;
    }
    for(i=1;i<=n;i++)
        for(j=i;j<=i+b-1&&j<=n;j++)
        if((s[j]-s[i-1])%k==0&&j-i+1>=a)
            nr++;
    printf("%d",nr);
    return 0;
}