import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        char[] colors = sc.next().toCharArray();
        long[] sums = new long[n + 1];
        long min = 0;
        long max = 0;
        long plus = Long.MIN_VALUE;
        long minus = Long.MAX_VALUE;
        for (int i = 0; i < n; i++) {
            int x = sc.nextInt();
            if (colors[i] == 'B') {
                sums[i + 1] = sums[i] + x;
            } else {
                sums[i + 1] = sums[i] - x;
            }
            plus = Math.max(plus, sums[i + 1] - min);
            minus = Math.min(minus, sums[i + 1] - max);
            min = Math.min(min, sums[i + 1]);
            max = Math.max(max, sums[i + 1]);
        }
        minus *= -1;
        System.out.println(Math.max(plus, minus));
    }
} 
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}