from sys import stdin


def main():
    input = lambda: stdin.readline()[:-1]
    N = int(input())
    S = input()
    A = list(map(int, input().split()))

    if S[0] == "R":
        r, b = A[0], 0
    else:
        r, b = 0, A[0]
    max_current = max_global = A[0]
    for i, n in enumerate(A[1:], start=1):
        if S[i] == "R":
            r += n
        else:
            b += n
        max_current = max(abs(n), abs(r - b))
        if abs(n) > abs(r - b):
            if S[i] == "R":
                r, b = n, 0
            else:
                r, b = 0, n
        if max_current > max_global:
            max_global = max_current
    print(max_global)


main()