n = int(input())
s = input().strip()
a = list(map(int, input().split()))

c = []
for i in range(n):
    if s[i] == 'R':
        c.append(a[i])
    else:
        c.append(-a[i])

if not c:
    print(0)
else:
    current_max = current_min = c[0]
    max_sub = current_max
    min_sub = current_min
    
    for num in c[1:]:
        prev_max, prev_min = current_max, current_min
        current_max = max(num, prev_max + num, prev_min + num)
        current_min = min(num, prev_max + num, prev_min + num)
        
        if current_max > max_sub:
            max_sub = current_max
        if current_min < min_sub:
            min_sub = current_min
    
    res = max(abs(max_sub), abs(min_sub))
    print(res)