N = int(input())
A = list(map(int,input().split()))
B = list(map(int,input().split()))
C = [(a,b) for a,b in zip(A,B)]
C.sort(key = lambda x:x[1],reverse = True)
P = 10 ** 9 + 7
ans = 0
now = 1
for a,b in C:
    ans += now * a
    ans %= P
    now = now * b % P
print(ans)