#include <iostream>
#include<fstream>
using namespace std;
int n,i,k,a,b,v[500000],s,a1,nr,j,b1;
int main()
{
  ifstream f("divk.in");
  ofstream g("divk.out");
  f>>n>>k>>a>>b;
     for(i=1;i<=n;i++)
     {
         f>>v[i];
     }
     for(i=1;i<=n-a+1;i++)
     {   a1=i+a-1;b1=a1+b;
         while((a1<b1)&&(a1<=n))
         {
            s=0;
         for(j=i;j<=a1;j++)s=s+v[j];
          if(s%k==0)nr++;
          a1++;
         }
     }
     g<<nr;
    return 0;
}