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

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);

    int k;
    cin >> k;
    vector<int> c(k);
    for (auto& i : c) cin >> i;
    int n;
    cin >> n;
    vector<int> x(n);
    for (auto& i : x) cin >> i, --i;
    int ans = 0;
    for (int mask = 0; mask < (1 << n); ++mask) {
        auto d = c;
        int cur = 0;
        for (int i = 0; i < n; ++i) {
            int d1 = (mask >> i & 1);
            int d2 = (mask >> i & 1);
            if (c[x[i] + d1] > 0) c[x[i] + d1]--;
            else if (c[x[i] + d2] > 0) c[x[i] + d2]--;
            else cur++;
        }
        ans = max(ans, cur);
        c = d;
    }
    cout << ans;
}