#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n);i++)
#define sz(x) int(x.size())
typedef long long ll;
typedef pair<int,int> P;

int main(){
  int n, m;
  cin >> n;
  vector<int> a(n);
  rep(i,n) cin >> a[i];
  cin >> m;
  vector<int> b(m);
  rep(i,m) cin >> b[i];
  sort(b.begin(), b.end(), greater<int>());
  vector<int> dp(1<<n,0);
  dp[0] = 1;

  vector<int> w(1<<n,0);
  for (int bit = 0; bit < (1 << n); bit++) for (int j = 0; j < n; j++) if (bit & (1 << j)) w[bit] += a[j];

  for (int i = 0; i < m; i++) {
    vector<int> dp2(1<<n,0);
    for (int bit1 = 0; bit1 < (1 << n); bit1++) {
      for (int bit2 = 0; bit2 < (1 << n); bit2++) {
        if ((bit1&bit2) == 0 && dp[bit1] && w[bit2] <= b[i]) dp2[bit1 | bit2] = 1;
      }
      if (dp2[(1<<n)-1]) {
        cout << i + 1 << endl;
        return 0;
      }
    }
    dp = dp2;
  }
  cout << -1 << endl;
  return 0;
}