#include<fstream.h>
int x[500001][500001],i,j,k,l,m,a,b,n,d,nr,h;
int main(){
ifstream f("divk.in");
ofstream g("divk.out");
f>>n>>k>>a>>b;
for(i=1;i<=n;i++)
	{f>>m;
	m%=k;
	x[i][i]=x[0][i]=m;
	}
for(i=1;i<=n;i++)
for(j=i+1;j<=n;j++)
	{m=x[i][j-1];
	m+=x[0][j];
	m%=k;
	x[i][j]=m;
	l=j-i+1;
	if((l>=a)&&(l<=b)&&(m==0))
		nr++;

	}
g<<nr;
f.close();
g.close();
return 0;

}