#include <fstream>
#include <cstdio>
using namespace std;
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);
    for(i=1;i<=N;i++)
        fscanf(f,"%d",&v[i]);


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

    return 0;
}