from heapq import heappush, heappop

n = int(input())
A = list(map(int,input().split()))
B = list(map(int,input().split()))

ans = 10**10
base = []
for ind,a in enumerate(A):
    heappush(base, (a,0,ind))
for i in range(n):
    count = [0]*n
    h = base.copy()
    for j in range(n):
        a,num,ind = heappop(h)
        count[ind] += 1
        a += B[(i+j)%n]//2
        heappush(h, (a,num+1,ind))
    ans = min(ans,max(count))
print(ans)