#include <iostream>
#include <fstream>

#define NR 500001

using namespace std;
int v[NR],k,a,b,n,div2;

void citire()
{
	ifstream fin("divk.in");
	fin>>n>>k>>a>>b;
	for(int i=1;i<=n;i++)
	{
		int x;
		fin>>x;
		v[i]=v[i-1]+x;
	}
}

int main()
{
	citire();
	for(int i=n;i>=n-a;i--)
	{
		for(int j=a;j<=b;j++)
		{
			if((v[i]-v[i-j])%k==0) div2++;
			if(i-j==0) break;
		}
	}
	ofstream fout("divk.out");
	fout<<div2;
	return 0;
}