rambless

import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
            int n = in.nextInt();
            //重量
            int[] w_arr = new int[n];
            for (int i = 0; i < n; i++) {
                w_arr[i] = in.nextInt();
            }
            //数量
            int[] n_arr = new int[n];
            for (int i = 0; i < n; i++) {
                n_arr[i] = in.nextInt();
            }
            //枚举所有情况、利用set去重：每种砝码(不加、加1个...加n_arr[i]个)
            Set<Integer> list = new HashSet<>();
            Set<Integer> li;
            for (int i = 0; i < w_arr.length; i++) {
                li = new HashSet<>();
                for (int j = 0; j <= n_arr[i]; j++) {
                    int temp = w_arr[i] * j;
                    if (list.isEmpty()) {
                        list.add(temp);
                    } else {
                        for (Integer integer : list) {
                            li.add(temp + integer);
                        }
                    }
                }
                list.addAll(li);
            }
            System.out.println(list.size());
        }
    }
}