Shared code

//package pratice;

import java.io.*;
import java.util.*;

public class Main {
	static class FastReader{
		BufferedReader br ;
		StringTokenizer st;
		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));	
		}
		String next() {
			while(st==null || !st.hasMoreElements()){try {st = new StringTokenizer(br.readLine());}catch(IOException e) {e.printStackTrace();}}
			return st.nextToken();
		}
		int nextInt(){return Integer.parseInt(next());}
		long nextLong(){return  Long.parseLong(next());}
		double nextDouble(){return Double.parseDouble(next());}
		float nextFloat(){return Float.parseFloat(next());}
		String nextLine(){
			String str = "";
			try {
				str = br.readLine();
			}catch(IOException e) {
				e.printStackTrace();
			}
			return str ;
		}
	}
	public static void main(String[] args) {
		long start2 = System.currentTimeMillis();
		FastReader fs = new FastReader();
		//int t = fs.nextInt();
		int t =1;
		while(t-->0) {
			int n = fs.nextInt();
			int m = fs.nextInt();
			long k = fs.nextLong();
			ArrayList<Long> a = new ArrayList<>();
			ArrayList<Long> b = new ArrayList<>();
			for(int i =0;i<n;i++) {
				a.add(fs.nextLong());
			}
			Collections.sort(a);
			for(int i =0;i<m;i++) {
				b.add(fs.nextLong());
			}
			Collections.sort(b);
			int i =0,j=0,cnt=0;
			while(i<n&&j<m) {
				if(a.get(i)>b.get(j)+k) {
					j++;
				}
				else if(a.get(i)<b.get(j)-k) {
					i++;
				}
				else {
					j++;i++;cnt++;
				}
			}
			System.out.println(cnt);
		}  
		long end2 = System.currentTimeMillis();
		//System.out.println("time :"+(end2-start2));
	//	sc.close();
	}
	private static int g(int n) {
		return n ^ (n >> 1);
	}
	
}