using System;
using System.Collections.Generic;
using System.Collections;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.IO;
using System.Reflection;
using static System.Math;
using System.Numerics;
using System.Threading;
using System.Runtime.CompilerServices;
using System.Diagnostics;
using nint=System.Int64;
static class Program{
	const long inf=long.MaxValue>>1;
	const int mod=998244353;
	static Sc sc=new Sc();
	static void Main(){
		Pt pt=new Pt(Solve);
		pt.Sm();
	}
	static void Solve(Pt pt) {
		var (n,k,l,p)=sc.Tp4<int>();
		int f = n>>1;
		int g = n-f;
		var a = new int[f][];
		var b = new int[g][];
		for(int i = 0;i<f;i++) { a[i]=sc.Ia; }
		for(int i = 0;i<g;i++) { b[i]=sc.Ia; }
		int m = 1<<f;
		var dp1 = new long[m];
		var dp2 = new long[m];
		var li = new List<(long c, long p)>[f+1];
		for(int i = 0;i<=f;i++) { li[i]=new List<(long c, long p)>(); }
		li[0].Add((0, 0));
		for(int i = 1, j = 0;i<m;i++) {
			if((1<<(j+1))<=i) { j++; }
			dp1[i]=dp1[i-(1<<j)]+a[j][0];
			dp2[i]=dp2[i-(1<<j)]+a[j][1];
			li[Pc(i)].Add((dp1[i], dp2[i]));
		}
		var wm = new Wm[f+1];
		for(int i = 0;i<=f;i++) {
			li[i].Sort((u,v) => u.c.CompareTo(v.c));
			var arr = li[i].Select(e => e.p).ToArray();
			wm[i]=new Wm(arr);
		}
		m=1<<g;
		dp1 = new long[m];
		dp2 = new long[m];
		long ans = 0;
		Fu(0,0,0);
		for(int i = 1, j = 0;i<m;i++) {
			if((1<<(j+1))<=i) { j++; }
			dp1[i]=dp1[i-(1<<j)]+b[j][0];
			dp2[i]=dp2[i-(1<<j)]+b[j][1];
			Fu(Pc(i),dp1[i],dp2[i]);
		}
		void Fu(int bn,long cn,long pn) {
			if(l-cn<0) return;
			for(int i = 0;bn+i<=k&&i<=f;i++) {
				int lb = -1, ub = li[i].Count, mid = 0;
				while(lb+1!=ub) {
					mid=(ub+lb)/2;
					if(li[i][mid].c>l-cn) { ub=mid; }
					else { lb=mid; }
				}
				if(p-pn<=0) {
					ans+=ub;
					continue;
				}
				else if(lb>=0){
					ans+=wm[i].Rm(0,lb,p-pn-1);
				}
			}
		}
		pt.Wl(ans);
	}
	static int Pc(int n) {
		n-=(n>>1)&0x55555555;
		n=(n&0x33333333)+((n>>2)&0x33333333);
		return ((n+(n>>4)&0xF0F0F0F)*0x1010101)>>24;
	}
}
static class Ex1 {
	public static int Bs(this int[] a,int x,bool b) { return Bs2(a,x,b,a.Length); }
	public static int Bs(this int[] a,int x,bool b,int ub) { return Bs2(a,x,b,ub+1); }
	private static int Bs2(int[] a,int x,bool b,int ub) {
		int lb = -1, mid = 0;
		while(ub-lb>1) {
			mid=(ub+lb)/2;
			if(a[mid]>=x) { ub=mid; }
			else { lb=mid; }
		}
		return b ? lb : ub;
	}
}
public class Wm {
	private int[][] ra;
	private int[] za;
	private const int b = 60;
	private int n;
	public Wm(nint[] a) {
		n=a.Length;
		var d = new int[b+1][];
		ra=new int[b+1][];
		for(int i = 0;i<=b;i++) {
			d[i]=new int[n];
			ra[i]=new int[n+1];
		}
		var d0 = new nint[2][] { new nint[n],new nint[n] };
		var d1 = new nint[2][] { new nint[n],new nint[n] };
		var h0 = new int[] { 0,0 };
		var h1 = new int[] { 0,0 };
		za=new int[b+1];
		for(int i = 0;i<n;i++) {
			if((a[i]&(1L<<b))==0) {
				d0[1][h0[1]]=a[i];
				h0[1]++;
				za[b]++;
			}
			else {
				d1[1][h1[1]]=a[i];
				h1[1]++;
				d[b][i]=ra[b][i+1]=1;
			}
			ra[b][i+1]+=ra[b][i];
		}
		for(int i = 1;i<=b;i++) {
			nint g = 1L<<(b-i), p = i&1;
			h0[p^1]=h1[p^1]=0;
			for(int j = 0;j<h0[p];j++) {
				if((d0[p][j]&g)==0) {
					d0[p^1][h0[p^1]]=d0[p][j];
					h0[p^1]++;
					za[b-i]++;
				}
				else {
					d1[p^1][h1[p^1]]=d0[p][j];
					h1[p^1]++;
					d[b-i][j]=ra[b-i][j+1]=1;
				}
				ra[b-i][j+1]+=ra[b-i][j];
			}
			for(int j = 0;j<h1[p];j++) {
				if((d1[p][j]&g)==0) {
					d0[p^1][h0[p^1]]=d1[p][j];
					h0[p^1]++;
					za[b-i]++;
				}
				else {
					d1[p^1][h1[p^1]]=d1[p][j];
					h1[p^1]++;
					d[b-i][h0[p]+j]=ra[b-i][h0[p]+j+1]=1;
				}
				ra[b-i][h0[p]+j+1]+=ra[b-i][h0[p]+j];
			}
		}
	}
	public int Rk(int l,int r,long k) {
		l--;
		for(int i = b;i>=0;i--) {
			if(((k>>i)&1)==1) {
				r=ra[i][r+1]+za[i]-1;
				l=ra[i][l+1]+za[i]-1;
			}
			else {
				r=r-ra[i][r+1];
				l=l-ra[i][l+1];
			}
		}
		return r-l;
	}
	public int Rl(int l,int r,long k) {
		l--;
		int p = 0;
		for(int i = b;i>=0;i--) {
			if(((k>>i)&1)==1) {
				p+=r-l;
				r=ra[i][r+1]+za[i]-1;
				l=ra[i][l+1]+za[i]-1;
				p-=r-l;
			}
			else {
				r=r-ra[i][r+1];
				l=l-ra[i][l+1];
			}
		}
		return p;
	}
	public int Rm(int l,int r,long k) {
		l--;
		int p = 0;
		for(int i = b;i>=0;i--) {
			if(((k>>i)&1)==1) {
				r=ra[i][r+1]+za[i]-1;
				l=ra[i][l+1]+za[i]-1;
			}
			else {
				p+=r-l;
				r=r-ra[i][r+1];
				l=l-ra[i][l+1];
				p-=r-l;
			}
		}
		return p;
	}
	public nint Qt(int l,int r,int k) {
		l--;
		nint p = 0;
		for(int i = b;i>=0;i--) {
			if((r-ra[i][r+1])-(l-ra[i][l+1])<k) {
				k-=(r-ra[i][r+1])-(l-ra[i][l+1]);
				r=ra[i][r+1]+za[i]-1;
				l=ra[i][l+1]+za[i]-1;
				p|=1L<<i;
			}
			else {
				r=r-ra[i][r+1];
				l=l-ra[i][l+1];
			}
		}
		return p;
	}
	public nint Pv(int l,int r,int k) {
		int p = Rl(l,r,k);
		return p!=0 ? Qt(l,r,p) : -1;
	}
	public nint Nv(int l,int r,int k) {
		int p = Rm(l,r,k);
		return p!=0 ? Qt(l,r,r-l+1-p+1) : -1;
	}
}
public class Pt{
	private StringBuilder sb=new StringBuilder();
	public Pt(Action<Pt> f){f(this);}
	public void W(int s){sb.Append(s);}
	public void W(long s){sb.Append(s);}
	public void W(double s){sb.Append(s);}
	public void W(decimal s){sb.Append(s);}
	public void W(char s){sb.Append(s);}
	public void W(string s){sb.Append(s);}
	public void W(object s){sb.Append(s);}
	public void W(params object[] s){sb.Append(string.Join(" ",s));}
	public void Wl(int s){sb.Append(s).AppendLine();}
	public void Wl(long s){sb.Append(s).AppendLine();}
	public void Wl(double s){sb.Append(s).AppendLine();}
	public void Wl(decimal s){sb.Append(s).AppendLine();}
	public void Wl(char s){sb.Append(s).AppendLine();}
	public void Wl(string s){sb.AppendLine(s);}
	public void Wl(object s){sb.Append(s).AppendLine();}
	public void Wl(int[] s){sb.AppendLine(string.Join(" ",s));}
	public void Wl(long[] s){sb.AppendLine(string.Join(" ",s));}
	public void Wl(double[] s){sb.AppendLine(string.Join(" ",s));}
	public void Wl(string[] s){sb.AppendLine(string.Join(" ",s));}
	public void Wl(params object[] s){sb.AppendLine(string.Join(" ",s));}
	public void Wl(){sb.AppendLine();}
	public void Sm(){Console.Write(sb);}
	public void Op(StreamWriter sw){
		sw.Write(sb);
		sw.Close();
	}
	public static bool operator ==(Pt a,Pt b){return a.sb.ToString()==b.sb.ToString();}
	public static bool operator !=(Pt a,Pt b){return a.sb.ToString()!=b.sb.ToString();}
	public override bool Equals(object obj){return false;}
	public override int GetHashCode(){return 0;}
}
public class Sc{
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	protected virtual string Rl(){return Console.ReadLine();}
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	protected virtual string[] Sp(string st){return st.Split();}
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	private T Ct<T>(string s){return (T)Convert.ChangeType(s,typeof(T));}
	public virtual int I{get{return int.Parse(Rl());}}
	public virtual long L{get{return long.Parse(Rl());}}
	public virtual double D{get{return double.Parse(Rl());}}
	public virtual string S{get{return Rl();}}
	public int[] Ia{get{return Array.ConvertAll(Sp(Rl()),int.Parse);}}
	public long[] La{get{return Array.ConvertAll(Sp(Rl()),long.Parse);}}
	public double[] Da{get{return Array.ConvertAll(Sp(Rl()),double.Parse);}}
	public string[] Sa{get{return Sp(Rl());}}
	public object[] Oa{get{return Sp(Rl());}}
	public int[] Ia2{get{return Array.ConvertAll(Sp("0 "+Rl()+" 0"),int.Parse);}}
	public int[] Ia3(string a,string b){return Array.ConvertAll(Sp(a+Rl()+b),int.Parse);}
	public int[] Ia3(int a){return Array.ConvertAll(Sp(Rl()+" "+a.ToString()),int.Parse);}
	public long[] La2{get{return Array.ConvertAll(Sp("0 "+Rl()+" 0"),long.Parse);}}
	public long[] La3(string a,string b){return Array.ConvertAll(Sp(a+Rl()+b),long.Parse);}
	public long[] La3(int a){return Array.ConvertAll(Sp(Rl()+" "+a.ToString()),long.Parse);}
	public double[] Da2{get{return Array.ConvertAll(Sp("0 "+Rl()+" 0"),double.Parse);}}
	public double[] Da3(string a,string b){return Array.ConvertAll(Sp(a+Rl()+b),double.Parse);}
	public T[] Arr<T>(int n,Func<T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f();}return a;}
	public T[] Arr<T>(int n,Func<int,T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i);}return a;}
	public T[] Arr<T>(int n,Func<string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(Sp(Rl()));}return a;}
	public T[] Arr<T>(int n,Func<int,string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i,Sp(Rl()));}return a;}
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public (T,T) Tp2<T>(){var s=Sp(Rl());return (Ct<T>(s[0]),Ct<T>(s[1]));}
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public (T,T,T) Tp3<T>(){var s=Sp(Rl());return (Ct<T>(s[0]),Ct<T>(s[1]),Ct<T>(s[2]));}
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public (T,T,T,T) Tp4<T>(){var s=Sp(Rl());return (Ct<T>(s[0]),Ct<T>(s[1]),Ct<T>(s[2]),Ct<T>(s[3]));}
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public (T,T,T,T,T) Tp5<T>(){var s=Sp(Rl());return (Ct<T>(s[0]),Ct<T>(s[1]),Ct<T>(s[2]),Ct<T>(s[3]),Ct<T>(s[4]));}
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public (T,T,T,T,T,T) Tp6<T>(){var s=Sp(Rl());return (Ct<T>(s[0]),Ct<T>(s[1]),Ct<T>(s[2]),Ct<T>(s[3]),Ct<T>(s[4]),Ct<T>(s[5]));}
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public (T1,T2) Tp2<T1,T2>(){var s=Sp(Rl());return (Ct<T1>(s[0]),Ct<T2>(s[1]));}
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public (T1,T1,T2) Tp3<T1,T2>(){var s=Sp(Rl());return (Ct<T1>(s[0]),Ct<T1>(s[1]),Ct<T2>(s[2]));}
}
public class Scr:Sc{
	private List<string> li=new List<string>();
	private int l=0;
	private bool bo=false;
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	protected override string Rl(){
		if(bo){return li[l++%li.Count];}
		li.Add(Console.ReadLine());
		return li[li.Count-1];
	}
	public void Again(){bo=true;}
}
public class Scs:Sc{
	private StreamReader sr;
	public Scs(string t){sr=new StreamReader(t);}
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	protected override string Rl(){return sr.ReadLine();}
	public void Close(){sr.Close();}
}
public class Sc2:Sc{
	private string[] sps=new string[]{" ","　","\t"};
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	protected override string[] Sp(string st){return st.Split(sps,StringSplitOptions.RemoveEmptyEntries);}
	public override int I{get{return int.Parse(Sp(Rl())[0]);}}
	public override long L{get{return long.Parse(Sp(Rl())[0]);}}
	public override double D{get{return double.Parse(Sp(Rl())[0]);}}
	public override string S{get{return Sp(Rl())[0];}}
}
public class Scs2:Sc2{
	private StreamReader sr;
	public Scs2(string t){sr=new StreamReader(t);}
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	protected override string Rl(){return sr.ReadLine();}
	public void Close(){sr.Close();}
}
public class Sct:Sc{
	private List<string> li=new List<string>();
	private int l=0;
	public void Add(int s){li.Add(s.ToString());}
	public void Add(long s){li.Add(s.ToString());}
	public void Add(double s){li.Add(s.ToString());}
	public void Add(string s){li.Add(s.ToString());}
	public void Add(object s){li.Add(s.ToString());}
	public void Add(int[] s){li.Add(string.Join(" ",s));}
	public void Add(long[] s){li.Add(string.Join(" ",s));}
	public void Add(double[] s){li.Add(string.Join(" ",s));}
	public void Add(string[] s){li.Add(string.Join(" ",s));}
	public void Add(params object[] s){li.Add(string.Join(" ",s));}
	protected override string Rl(){return li[l++];}
	public void Clear(){li.Clear();l=0;}
	public void Again(){l=0;}
	public void Pf(){Console.WriteLine(string.Join("\n",li));}
}