import heapq

N = int(input())
A = tuple(map(int, input().split()))
B = tuple(map(int, input().split())) * 2

ans = float('inf')
for i in range(N):
    heapq.heapify(h := [a * 10000 for a in A])
    for j in range(N):
        x = heapq.heappop(h)
        x += (B[i + j] // 2) * 10000 + 1
        heapq.heappush(h, x)
    ans = min(ans, max(a % 10000 for a in h))
print(ans)