题解 | #称砝码#

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        while (sc.hasNextInt()){

            HashSet<Integer> set = new HashSet<>();
            set.add(0);

            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();
            }

            for (int i = 0; i < n; i++) {
                List<Integer> list = new ArrayList<>(set);
                for (int j = 0; j <= x[i]; j++) {
                    for (int k = 0; k < list.size(); k++) {
                        set.add(list.get(k)+m[i]*j);
                    }
                }
            }
            System.out.println(set.size());
        }
    }
}