#include <fstream>

using namespace std;
ifstream f("divk.in");
ofstream g("divk.out");
int n,i,j,nr,v[1000001],k,a,b,s;
int main()
{f>>n>>k>>a>>b;
for(i=1;i<=n;i++)f>>v[i];
for(i=1;i<=n-k;i++){s=0;
                    for(j=i;j<=i+a-2;j++)s=s+v[j];
                    for(j=i+a-1;j<=i+b;j++){s=s+v[j];
                                          if(s%k==0)nr++;}}
g<<s;

    return 0;
}