#include<fstream>
using namespace std;

int i,j,n,m,k,a,b;
unsigned long s=0,p[5000001];
unsigned long long nr=0;
int main()
{
	//std:: ifstream f("divk.in");
	//std:: ofstream g("divk.out");
	FILE *f=fopen("divk.in","r");
	FILE *g=fopen("divk.out","w");
	fscanf(f,"%d%d%d%d",&n,&k,&a,&b);
	for(i=1;i<=n;i++)
		fscanf(f,"%ld",&p[i]);
	for(i=1;i<=n;i++)
	{
		s=0;
		for(j=i;j<=i+b-1&&j<=n;j++)
		{
			s+=p[j];
			if(s%k==0&&j-i+1>=a)
				nr++;
		}
	}
	fprintf(g,"%lld",nr);
	return 0;
}