import heapq
N = int(input())
S = list(input())
A = list(map(int, input().split())) 
ans = 0
h = []
cnt = 0
for s,a in zip(S,A):
    if s=='(':
        cnt+=1
    else:
        heapq.heappush(h,a)
        cnt-=1
        if cnt<0:
            cnt+=2
            ans+=heapq.heappop(h)
h = []
cnt = 0
for s,a in zip(S[::-1],A[::-1]):
    if s==')':
        cnt+=1
    else:
        heapq.heappush(h,a)
        cnt-=1
        if cnt<0:
            cnt+=2
            ans+=heapq.heappop(h)
print(ans)