#include "bits/stdc++.h"
using namespace std;

bool dp[1 << 10];
bool dp2[1 << 10];

int main(){
	int N;
	cin >> N;
	vector<int> A(N);
	for (int i = 0; i < N; i++)
	{
		cin >> A[i];
	}
	int M;
	cin >> M;
	vector<int> B(M);
	for (int i = 0; i < M; i++)
	{
		cin >> B[i];
	}

	sort(B.begin(), B.end());
	reverse(B.begin(), B.end());
	dp[0] = true;

	for (int i = 0; i < M; i++)
	{
		for (int j = 0; j < (1 << N); j++)
		{
			int c = 0;
			for (int k = 0; k < N; k++)
			{
				if ((j >> k) % 2 == 0) continue;
				c += A[k];
			}
			if (c > B[i]) continue;

			for (int k = (1 << N) - 1; k >= 0; k--)
			{
				dp2[j | k] |= dp[k];
			}
		}

		for (int k = (1 << N) - 1; k >= 0; k--)
		{
			dp[k] = dp2[k];
		}
		if (dp[(1 << N) - 1]){
			cout << (i + 1) << endl;
			return 0;
		}
	}
	cout << -1 << endl;
}