#include <iostream>
#include <fstream>

#define NR 500001

using namespace std;
int v[NR],k2,a,b,n,div2,v2[NR];

void citire()
{
	ifstream fin("divk.in");
	fin>>n>>k2>>a>>b;
	for(int i=1;i<=n;i++)
	{
		int x;
		fin>>v2[i];
		x=v2[i];
		v[i]=(v[i-1]+x%k2)%k2;
	}
}

int main()
{
	citire();
	for(int i=1;i<=n-a+1;i++)
	{
		int s=0;
		s+=v[i]-v[i-a+1];
		for(int j=a;j<=b && i+j-1<=n;j++)
		{
			s+=v2[i+j-1];
			if(s%k2==0) div2++;
		}
	}
	ofstream fout("divk.out");
	fout<<div2;
	return 0;
}