#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  int n;
  string s;
  cin >> n >> s;
  const int m = 2 * n;
  vector<ll> a(m);
  rep(i, m) cin >> a[i];
  constexpr ll INF = 1e18;
  vector dp(m + 1, vector<ll>(n + 1, INF));
  dp[0][0] = 0;
  rep(i, m) {
    char c = s[i];
    int dif = (c == '(' ? 1 : -1);
    rep(j, n + 1) {
      if (dp[i][j] == INF) continue;
      // そのまま
      if (0 <= j + dif && j + dif <= n) dp[i + 1][j + dif] = min(dp[i + 1][j + dif], dp[i][j]);
      // かえる
      if (0 <= j - dif && j - dif <= n) dp[i + 1][j - dif] = min(dp[i + 1][j - dif], dp[i][j] + a[i]);
    }
  }
  cout << dp[m][0] << '\n';
  return 0;
}