import sys
input = lambda : sys.stdin.readline().rstrip()

sys.setrecursionlimit(2*10**5+10)
write = lambda x: sys.stdout.write(x+"\n")
debug = lambda x: sys.stderr.write(x+"\n")

n = int(input())
s = input()
a = list(map(int, input().split()))
dp0 = [0]
dp1 = [0]
ans = -float("inf")
for i in range(n):
    v0 = max(dp0[-1], 0)
    v1 = max(dp1[-1], 0)
    v = a[i]
    if s[i]=="R":
        v0 += v
        v1 -= v
    else:
        v0 -= v
        v1 += v
    dp0.append(v0)
    dp1.append(v1)
    ans=max(ans,v0,v1)
print(ans)