import copy
N = int(raw_input())
_A = [[i,0] for i in sorted(map(int,raw_input().split()))]
B = map(int,raw_input().split())

ans = 1500
for sp in xrange(N):
    A = copy.deepcopy(_A)
    for i in xrange(sp, N+sp):
        i %= N
        A[0][0] += B[i]/2
        A[0][1] += 1
        A = sorted(sorted(A, key = lambda x:x[1]))
    ans = min(ans, max(a[1] for a in A))
print ans