import sys
from fractions import Fraction

from typing import List, Tuple

int1 = lambda x: int(x) - 1
input = lambda: sys.stdin.readline().rstrip('\n')
ii = lambda: int(input())
vi = lambda: list(map(int, input().split()))
vi1 = lambda: list(map(int1, input().split()))


def dbg(*args, **kwargs):
    print(*(repr(arg) for arg in args), *(f'{k}: {repr(v)}' for k, v in kwargs.items()),
          sep='; ', file=sys.stderr, flush=True)


def main():
    n = ii()
    a = vi()
    b = vi()
    arr = []
    sm = 0
    for av, bv in zip(a, b):
        if av == 0:
            continue
        arr.append((Fraction(bv, av), abs(av)))
        sm += abs(av)

    arr.sort()

    tt = 0
    for a, b in arr:
        tt += b
        if 2 * tt >= sm:
            c, d = a.as_integer_ratio()
            return c * pow(d, -1, 10 ** 9 + 7) % (10 ** 9 + 7)


def _start():
    if (ret := main()) is not None:
        print(*ret) if isinstance(ret, List) or isinstance(ret, Tuple) else print(ret)


if __name__ == '__main__':
    _start()