#include <fstream>

using namespace std;
ifstream cin("divk.in");
ofstream cout("divk.out");
unsigned long long n,i,j,k,a,b,v[10000],s[10000],nr;
int main()
{
    cin>>n>>k>>a>>b;
    for(i=1;i<=n;i++)
    {
        cin>>v[i];
        s[i]=s[i-1]+v[i]%k;
    }
    for(i=1;i<=n-a;i++)
    {
        for(j=i+a-1;j<=i+b,j<=n;j++)
        {
            if((s[j]-s[i-1])%k==0)
            {
                nr++;
                //cout<<i<<" "<<j<<endl;
            }
        }
    }
    cout<<nr;
    return 0;
}