OJ---称砝码

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int num[] = new int[n];
        int weight[] = new int[n];
        for (int i = 0; i < n; i++) {
            weight[i] = in.nextInt();
        }
        for (int i = 0; i < n; i++) {
            num[i] = in.nextInt();
        }
        HashSet<Integer> set = new HashSet<>();
        set.add(0);
        for (int i = 0; i < n; i++) {
            ArrayList<Integer> list = new ArrayList<>(set);
            for (int m : list) {
                for (int j = 1; j <= num[i]; j++) {
                    set.add(m+weight[i]*j);
                }
            }
        }
        System.out.println(set.size());
    }
}