import sys

sys.setrecursionlimit(10**6)
int1 = lambda x: int(x)-1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.buffer.readline())
def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def LI1(): return list(map(int1, sys.stdin.buffer.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def BI(): return sys.stdin.buffer.readline().rstrip()
def SI(): return sys.stdin.buffer.readline().rstrip().decode()
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
inf = 10**16
md = 998244353
# md = 10**9+7

n=II()
s=SI()
aa=LI()
cs=[0]
for c,a in zip(s,aa):
    if c=="R":cs.append(cs[-1]+a)
    else:cs.append(cs[-1]-a)

ans=-inf
mx=mn=0
for i in range(n):
    ans=max(ans,-(cs[i+1]-mx),cs[i+1]-mn)
    mx=max(mx,cs[i+1])
    mn=min(mn,cs[i+1])

print(ans)