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

    return 0;
}