import sys, random
input = lambda : sys.stdin.readline().rstrip()
sys.setrecursionlimit(3*10**5+10)

write = lambda x: sys.stdout.write(x+"\n"); writef = lambda x: print("{:.12f}".format(x))
debug = lambda x: sys.stderr.write(x+"\n")
YES="Yes"; NO="No"; pans = lambda v: print(YES if v else NO); inf=10**18
LI = lambda : list(map(int, input().split()))
def debug(_l_):
    for s in _l_.split():
        print(f"{s}={eval(s)}", end=" ")
    print()
def dlist(*l, fill=0):
    if len(l)==1:
        return [fill]*l[0]
    ll = l[1:]
    return [dlist(*ll, fill=fill) for _ in range(l[0])]

n = int(input())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
index = list(range(n))
index.sort(key=lambda i: -(b[i]-1)/a[i])
c = 1
ans = 0
M = 10**9+7
for i in index:
    ans += c*a[i]%M
    c *= b[i]
    c %= M
print(ans%M)