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

typedef long long Int;
#define REP(i,n) for(int (i)=0;(i)<(int)(n);++(i))

int N;
int M;
int A[10];
int B[10];

int cost[1 << 10];

bool visited[10][1 << 10];

int ans;
void rec(int d, int done) {
	if (done == (1 << N) - 1) {
		if (ans == -1 || ans > d) ans = d;
		return;
	}
	if (d >= M) return;
	if (ans != -1 && ans <= d + 1) return;

	if (visited[d][done]) return;
	visited[d][done] = true;

	for (int bits = 1; bits < (1 << N); bits++) {
		if ((done & bits) == 0 && B[d] >= cost[bits]) {
			B[d] -= cost[bits];
			rec(d + 1, done | bits);
			B[d] += cost[bits];
		}
	}
}

int main() {
	cin >> N; REP(i, N) cin >> A[i];
	cin >> M; REP(i, M) cin >> B[i];
	sort(A, A + N);
	sort(B, B + M); reverse(B, B + M);

	REP(bits, 1 << N) {
		int s = 0;
		REP(i, N) if (bits >> i & 1) s += A[i];
		cost[bits] = s;
	}

	ans = -1;
	rec(0, 0);
	cout << ans << endl;
}