#region Header
#!/usr/bin/env python3
# from typing import *

import sys
import io
import math
import collections
import decimal
import itertools
from queue import PriorityQueue
import bisect
import heapq

def input():
    return sys.stdin.readline()[:-1]

sys.setrecursionlimit(1000000)
#endregion

# _INPUT = """# paste here...
# """
# sys.stdin = io.StringIO(_INPUT)

MOD = 1000000007

def main():
    N = int(input())
    A = [int(input()) for _ in range(N+1)]
    B = [int(input()) for _ in range(N+1)]

    # T[i] := B[0], ..., B[i] の和
    T = [B[0]]
    for i in range(1, N+1):
        T.append((T[-1] + B[i]) % MOD)

    v = sum(A[i]*T[N-i] for i in range(N+1)) % MOD
    print(v)

if __name__ == '__main__':
    main()