N=int(input())
S=input()
A=list(map(int,input().split()))
X=[0,0]
Y=[0,0]
for i in range(N):
  if S[i]=='R':
    if A[i]>0:
      X[1]+=A[i]
    else:
      X[0]+=A[i]
  else:
    if A[i]>0:
      Y[1]+=A[i]
    else:
      Y[0]+=A[i]
ANS=0
for i in range(2):
  for j in range(2):
    ANS=max(ANS,abs(X[i]-Y[j]))
print(ANS)