#include<cstdio>
using namespace std;
int j,nr,n,k,a,b,i,v[500010],sp[500010];
void sumepart()
{
    for(i=1;i<=n;i++) sp[i]=sp[i-1]+v[i];
}
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",&v[i]);
    sumepart();
    for(i=a;i<=b;i++)
    {
        for(j=1;j<=n-i+1;j++)
        {if((sp[j+i-1]-sp[j-1])%k==0) nr++;
        }
    }
    printf("%d",nr);
    return 0;
}