#!/usr/bin/env pypy3

import itertools


IMPOSSIBLE = -1


def main():
    num_items = int(input())
    items = map(int, input().split())
    num_boxes = int(input())
    boxes_base = sorted(map(int, input().split()), reverse=True)
    ans = num_boxes + 1
    for items_perm in itertools.permutations(items):
        boxes = boxes_base[:]
        item_idx = box_idx = 0
        while item_idx < num_items and box_idx < num_boxes:
            if boxes[box_idx] >= items_perm[item_idx]:
                boxes[box_idx] -= items_perm[item_idx]
                item_idx += 1
            else:
                box_idx += 1
        ans = min(ans, box_idx + 1)
    print(ans if ans <= num_boxes else IMPOSSIBLE)


if __name__ == '__main__':
    main()