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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N;
    string S;
    cin >> N >> S;
    vector<long long> dp(N + 1, 1LL << 60);
    dp[0] = 0;
    for (int i = 0; i < 2 * N; i++) {
        vector<long long> ep(N + 1, 1LL << 60);
        int A;
        cin >> A;
        for (int j = 0; j <= N; j++) {
            if (j > 0) {
                ep[j - 1] = min(ep[j - 1], dp[j] + (S[i] == '(' ? A : 0));
            }
            if (j < N) {
                ep[j + 1] = min(ep[j + 1], dp[j] + (S[i] == '(' ? 0 : A));
            }
        }
        dp = ep;
    }
    cout << dp[0] << endl;
}