#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);

    ll N;
    string S;
    cin >> N >> S;
    N *= 2;
    S = "*"+S;
    vector<ll> A(N+1);
    for (int i=1; i<=N; i++) cin >> A[i];

    vector dp(N+1, vector<ll>(N+1, 1e18));
    dp[0][0] = 0;
    for (int i=1; i<=N; i++){
        for (int j=0; j<=N; j++){
            if (S[i] == '('){
                if (j+1<=N) dp[i][j+1] = min(dp[i][j+1], dp[i-1][j]);
                if (j-1>=0) dp[i][j-1] = min(dp[i][j-1], dp[i-1][j]+A[i]);
            }
            else{
                if (j-1>=0) dp[i][j-1] = min(dp[i][j-1], dp[i-1][j]);
                if (j+1<=N) dp[i][j+1] = min(dp[i][j+1], dp[i-1][j]+A[i]);
            }
        }
    }

    cout << dp[N][0] << endl;

    return 0;
}