题解 | #称砝码#

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int kinds = Integer.parseInt(sc.nextLine());
        String[] weightArr = sc.nextLine().split(" ");
        String[] numArr = sc.nextLine().split(" ");

        Set<Integer> set = new HashSet<>();
        set.add(0);
        for(int i = 0; i < weightArr.length;i ++){

            for(int j = 0; j < Integer.parseInt(numArr[i]); j ++) {
                Set<Integer> tmpSet = new HashSet<>();
                Iterator<Integer> iterator = set.iterator();
                while (iterator.hasNext()) {
                    tmpSet.add(iterator.next() + Integer.parseInt(weightArr[i]));
                }
                set.addAll(tmpSet);
            }
        }
        System.out.println(set.size());
    }
}