#include <fstream>
using namespace std;
int a,b,n,d,i,m,j,p,s,v[500005];
int main()
{
    ifstream f ("divk.in");
    ofstream g ("divk.out");
f>>n>>d>>a>>b;
for (i=1;i<=n;i++)
    f>>v[i];
    for (i=a;i<=b;i++)
    {
        for (j=1;j<=n;j++)
        {
            if (j<a) s=s+v[j];
            else if (s%d==0) {p++;
            s=s-v[j-i+1]+v[j];}
            else s=s-v[j-i+1]+v[j];
    }
}
    g<<p;
}