using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var s = ReadLine();
        var a = NList;
        var cum = new long[n + 1];
        for (var i = 0; i < n; ++i)
        {
            if (s[i] == 'R') cum[i + 1] = cum[i] + a[i];
            else cum[i + 1] = cum[i] - a[i];
        }
        var ans = 0L;
        var max = 0L;
        var min = 0L;
        for (var i = 1; i <= n; ++i)
        {
            ans = Math.Max(ans, Math.Max(Math.Abs(max - cum[i]), Math.Abs(cum[i] - min)));
            max = Math.Max(max, cum[i]);
            min = Math.Min(min, cum[i]);
        }
        WriteLine(ans);
    }
}