from functools import cmp_to_key

mod = 10**9 + 7

n = int(input())
a = list(map(int,input().split()))
b = list(map(int,input().split()))
dat = [(a[i],b[i]-1) for i in range(n)]

def fraccomp(a, b):
	u = a[0] * b[1] - a[1] * b[0]
	if u > 0:
		return 1
	elif u < 0:
		return -1
	else:
		return 0

dat.sort(key=cmp_to_key(fraccomp))

#print(dat)

ans = 0
for i in range(n-1,-1,-1):
	ans = (dat[i][0] + (dat[i][1]+1) * ans) % mod

print(ans)