import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

"""


"""

BIG = 10 ** 20
def f(a, b):
    return (2 * a * BIG + b) // (2 * b)


n = ni()
a = na()
b = na()
idx = [i for i in range(n) if a[i] != 0]
a = [a[i] for i in idx]
b = [b[i] for i in idx]
n = len(a)

s = sorted(range(n), key = lambda i: f(b[i], a[i]))

i = s[(n-1) // 2]
mod = 10 ** 9 + 7
print(b[i] * pow(a[i], mod-2, mod) % mod)