import numpy as np
mod  =10**9+7
n = int(input())
A = list(int(input()) for _ in range(n+1))
B = [0]+list(int(input()) for _ in range(n+1))
B = np.cumsum(B)
ans = 0
for i in range(n+1):
    ans += A[i]*B[n-i+1]
    ans %= mod
print(ans%mod)