n = int(input())
s = list(input())
a = list(map(int, input().split()))

rb = [0]*(n+1)
br = [0]*(n+1)
sr, sb = 0, 0

for i in range(n):
    if s[i] == "R":
        sr += a[i]
    else:
        sb += a[i]
    rb[i+1] = sr-sb
    br[i+1] = sb-sr

print(max(max(rb)-min(rb), max(br)-min(br)))