#include<fstream>
using namespace std;
ifstream f("divk.in");
ofstream g("divk.out");
int n,k,a,b,nr,v[500005];
int main()
{
    int i,j;
    f>>n>>k>>a>>b;
    for (i=1;i<=n;++i) f>>v[i], v[i]+=v[i-1], v[i]%=k;
    for (i=0;i<=n-a;++i)
        for (j=i+a;j<=i+b && j<=n;++j)
            if (v[i]==v[j]) ++nr;
    g<<nr<<'\n';
    return 0;
}