#!/usr/bin/env python3

MOD = 1000000007
def solve(n, a, b) -> int:
    sum_b = sum(b)
    ans = 0
    for i in range(n + 1):
        ans += a[i] * sum_b
        sum_b -= b[n - i]
    return ans % MOD

def main():
    n = int(input())
    a = [int(input()) for _ in range(n + 1)]
    b = [int(input()) for _ in range(n + 1)]
    ans = solve(n, a, b)
    print(ans)

if __name__ == '__main__':
    main()