#include <fstream>
#include <cstdio>
using namespace std;
//ifstream f("divk.in");
ofstream g("divk.out");

int N,K,A,B,v[500000],s,i,j,k,nr;

int main()
{
    FILE *f;f=fopen("divk.in","r");
     fscanf(f,"%d %d %d %d",&N,&K,&A,&B);
   //f>>N>>K>>A>>B;
    for(i=1;i<=N;i++)
       fscanf(f,"%d",&v[i]);
         //f>>v[i];

    for(i=1;i<=N-A+1;i++)
       {s=0;
        for(j=i;j<=i+B && j<=N;j++)
            {
                s+=v[j];
                if(s%K==0 && j!=i)
                   nr++;


            }
       }
    g<<nr;

    return 0;
}