N = int(input())
S = str(input())
A = list(map(int,input().split()))
A0 = []; A1= []
for i in range(N):
    if S[i] == "R":
        val0 = A[i]
        val1 = -A[i]
    else:
        val0 = -A[i]
        val1 = A[i]
    A0.append(val0)
    A1.append(val1)
#print(A0,A1)
ans0 = 0
temp0 = 0
store0 = 0
for i in range(N):
    if A0[i] > 0:
        #temp0 += A0[i]
        store0 += A0[i]
    else:
        #temp0 = 0
        store0 += A0[i]
    if store0 < 0:
        store0 = 0
    #print(temp0,store0,A0[i])
    ans0 = max(ans0,store0)
#print(ans0)
    
ans1 = 0
temp1 = 0
store1 = 0
for i in range(N):
    if A1[i] > 0:
        #temp1 += A1[i]
        store1 += A1[i]
    else:
        #temp1 = 0
        store1 += A1[i]
    if store1 < 0:
        store1 = 0
    #print(temp1,store1,A[i])
    ans1 = max(ans1,store1)
#print(ans1)
print(max(ans0,ans1))