from itertools import accumulate


n = int(input())
A = [int(input()) for _ in range(n + 1)]
B = [int(input()) for _ in range(n + 1)]
mod = 10**9 + 7
a=list(accumulate(B))
ans=0
for i in range(n+1):
    ans+=A[i]*a[n-i]
    ans%=mod

print(ans)