#include <stdio.h>

#define INF 2000000000000LL

int main () {
  int n = 0;
  char s[2001] = "";
  long long a[2000] = {};
  
  int res = 0;
  
  long long dp[2001][1001] = {};
  
  res = scanf("%d", &n);
  res = scanf("%s", s);
  for (int i = 0; i < 2*n; i++) {
    res = scanf("%lld", a+i);
  }
  
  for (int i = 0; i < n; i++) {
    dp[0][i+1] = INF;
  }
  
  for (int i = 0; i < 2*n; i++) {
    for (int j = 0; j <= n; j++) {
      dp[i+1][j] = INF;
    }
    for (int j = 0; j < n; j++) {
      if (s[i] == '(' && dp[i][j] < dp[i+1][j+1]) {
        dp[i+1][j+1] = dp[i][j];
      } else if (s[i] == ')' && dp[i][j]+a[i] < dp[i+1][j+1]) {
        dp[i+1][j+1] = dp[i][j]+a[i];
      }
    }
    for (int j = 0; j < n; j++) {
      if (s[i] == '(' && dp[i][j+1]+a[i] < dp[i+1][j]) {
        dp[i+1][j] = dp[i][j+1]+a[i];
      } else if (s[i] == ')' && dp[i][j+1] < dp[i+1][j]) {
        dp[i+1][j] = dp[i][j+1];
      }
    }
  }
  
  printf("%lld\n", dp[2*n][0]);
  return 0;
}