from heapq import heappop,heappush
def Check(N, L, heap, x):
    ret = 0
    for i in range(N):
        Level, cnt = heappop(heap)
        Level += L[(x+i)%N]
        cnt += 1
        ret = max(ret, cnt)
        heappush(heap, (Level, cnt))
    return ret

N = int(input())
A = list(map(int,input().split()))
B = list(map(int,input().split()))
heap = []
for i in range(N):
    heappush(heap, (A[i], 0))
    B[i] //= 2
ans = 1<<32
for i in range(N):
    ans = min(ans, Check(N, B, heap, i))
print(ans)