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