题解 | #称砝码#

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 sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] m = new int[n];
        int[] x = new int[n];
        for (int i = 0; i < n; i++) {
            m[i] = sc.nextInt();
        }
        for (int i = 0; i < n; i++) {
            x[i] = sc.nextInt();
        }
        ArrayList<Integer> list = new ArrayList<>();
        HashSet<Integer> set = new HashSet<>();
        HashSet<Integer> newSet = new HashSet<>();
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < x[i]; j++) {
                list.add(m[i]);
            }
        }
        set.add(0);
        for (Integer value : list) {
            for (Integer integer : set) {
                newSet.add(integer + value);
            }
            set.addAll(newSet);
        }
        //System.out.println(set);
        System.out.println(set.size());
    }
}