#include<stdio.h>
#include<fstream>

using namespace std;

int sume[500010],nr;
long long sol;

int A,B,K,n;

int main()
{
	ifstream fin("divk.in");
	ofstream fout("divk.in");
	
	fin>>n>>K>>A>>B;
	
	for(int i=1;i<=n;i++)
	{
		fin>>nr;
	    sume[i]=sume[i-1]+nr;
		if(i-B>=0)
		{
			for(int j=i-B;j<=i-A;j++)
			{
				if((sume[i]-sume[j])%K==0) sol++;
			}
		}
		else
		{
			for(int j=1;j<=i-A;j++)
				if((sume[i]-sume[j])%K==0) sol++;
		}
	}
	fout<<sol;
	
}