/*
 ___   _   _    ___  __   ___ _  _     __   ____ ___ _  _   _
|__   /_\  |\ |  |  |  | |__  |__|     |_|  |__   |  |__|  /_\
___| /   \ | \|  |  |__| ___| |  |     |__| |___  |  |  | /   \

*/
#include <stdio.h>
#include <math.h>
#include <limits.h>
struct color
{
  char x;
  int y;
};
int f(struct color *, int, int);
int main()
{
  int n;
  scanf("%d", &n);
  struct color a[n];
  char s[n];
  scanf("%s", s);
  int i;
  for (i = 0; i < n; i++)
  {
    int v;
    scanf("%d", &v);
    a[i].x = s[i];
    a[i].y = v;
  }
  int j, max = INT_MIN;
  for (i = 0; i < n; i++)
  {
    for (j = i + 1; j < n; j++)
    {
      int ans = f(a, i, j);
      if (max < ans)
      {
        max = ans;
      }
    }
  }
  printf("%d", max);
  return 0;
}
int f(struct color *a, int l, int h)
{
  int i, r = 0, b = 0;
  for (i = l; i <= h; i++)
  {
    if (a[i].x == 'R')
    {
      r += a[i].y;
    }
    else
    {
      b += a[i].y;
    }
  }
  return abs(r - b);
}