#include <fstream>

using namespace std;
ifstream f("divk.in");
ofstream g("divk.out");
int n,c1,c2,poz,v[500005],s,k,i,l,submultimibune,m,kappa;
int main()
{
    f>>n>>k>>c1>>c2;poz=1;kappa=n-c1+1;
    for(i=1;i<=n;i++)f>>v[i];

    while(poz<=kappa)
    {   s=0;
        for(i=poz;i<c1;i++)s=s+v[i];
        for(l=c1;l<=c2;l++){s=s+v[l];
        if(s%k==0)submultimibune++;}
            poz++;c1++;if(c2<n)c2++;
    }
   g<<submultimibune<<'\n';
   f.close();
   g.close();
   return 0;

}