import java.io.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        Medicine[] medicines = new Medicine[n];
        for (int i = 0; i < n; i++) {
            medicines[i] = new Medicine(sc.nextInt());
        }
        for (int i = 0; i < n; i++) {
            medicines[i].setAdd(sc.nextInt());
        }
        Arrays.sort(medicines);
        Map<Integer, Integer> map = new HashMap<>();
        for (Medicine x : medicines) {
            if (map.containsKey(x.sum)) {
                x.sum = map.get(x.sum);
            }
            map.put(x.base, Math.max(x.sum, map.getOrDefault(x.base, 0)));
        }
        System.out.println(map.getOrDefault(1, 1));
    }
    
    static class Medicine implements Comparable<Medicine> {
        int base;
        int add;
        int sum;
        
        public Medicine(int base) {
            this.base = base;
        }
        
        public void setAdd(int v) {
            add = v;
            sum = base + add;
        }
        
        public int compareTo(Medicine another) {
            return another.base - base;
        }
    }
}
class Scanner {
    BufferedReader br;
    StringTokenizer st = new StringTokenizer("");

    public Scanner() {
        try {
            br = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            
        }
    }
    
    public int nextInt() {
        return Integer.parseInt(next());
    }
    
    public long nextLong() {
        return Long.parseLong(next());
    }
    
    public double nextDouble() {
        return Double.parseDouble(next());
    }
    
    public String next() {
        try {
            while (!st.hasMoreTokens()) {
                st = new StringTokenizer(br.readLine());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            return st.nextToken();
        }
    }
    
}