#ifdef LOCAL111
#else
	#define NDEBUG
#endif
#include <bits/stdc++.h>
const int INF = 1e9;
using namespace std;
template<typename T, typename U> ostream& operator<< (ostream& os, const pair<T,U>& p) { cout << '(' << p.first << ' ' << p.second << ')'; return os; }

#define endl '\n'
#define ALL(a)  (a).begin(),(a).end()
#define SZ(a) int((a).size())
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n)  FOR(i,0,n)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)
#define RBP(i,a) for(auto& i : a)
#ifdef LOCAL111
	#define DEBUG(x) cout<<#x<<": "<<(x)<<endl
	template<typename T> void dpite(T a, T b){ for(T ite = a; ite != b; ite++) cout << (ite == a ? "" : " ") << *ite; cout << endl;}
#else
	#define DEBUG(x) true
	template<typename T> void dpite(T a, T b){ return; }
#endif
#define F first
#define S second
#define SNP string::npos
#define WRC(hoge) cout << "Case #" << (hoge)+1 << ": "
#define rangej(a,b,c) ((a) <= (c) and (c) < (b))
#define rrangej(b,c) rangej(0,b,c)
template<typename T> void pite(T a, T b){ for(T ite = a; ite != b; ite++) cout << (ite == a ? "" : " ") << *ite; cout << endl;}
template<typename T> bool chmax(T& a, T b){if(a < b){a = b; return true;} return false;}
template<typename T> bool chmin(T& a, T b){if(a > b){a = b; return true;} return false;}

typedef long long int LL;
typedef unsigned long long ULL;
typedef pair<int,int> P;
typedef pair<LL,LL> LP;

void ios_init(){
	//cout.setf(ios::fixed);
	//cout.precision(12);
#ifdef LOCAL111
	return;
#endif
	ios::sync_with_stdio(false); cin.tie(0);	
}

int main()
{
	ios_init();
	int n;
	while(cin >> n){
		using bs = bitset<1<<10>;
		vector<int> a(n);
		REP(i,n) cin >> a[i];
		int m;
		cin >> m;
		vector<int> b(m);
		REP(i,m) cin >> b[i];
		sort(ALL(b),greater<int>());
		dpite(ALL(b));
		vector<bs> dp(m+1);
		dp[0][0] = true;
		vector<int> memo(1<<n);
		REP(mask,1<<n){
			int sum = 0;
			REP(i,n){
				if((mask>>i)&1){
					sum += a[i];
				}
			}
			memo[mask] = sum;
		}
		dpite(ALL(memo));
		int ans = -1;
		[&](){
			REP(i,m) REP(mask,1<<n){
				DEBUG(i);
				DEBUG(bitset<10>(mask));
				REP(mmask,1<<n){
					if((mask|mmask) == mask){
						if(memo[mmask] <= b[i] and dp[i][mask&(~mmask)]){
							DEBUG(bitset<10>(mmask));
							dp[i+1][mask] = true;
							break;
						}
					}
				}
				DEBUG(endl);
				if(dp[i+1][(1<<n)-1]){
					ans = i+1;
					return;
				}
			}
		}();
		cout << ans << endl;
	}
	return 0;
}