import math, sequtils, strutils
let
  n: int = stdin.readline.parseInt
  a: seq[int] = mapIt(0..n, stdin.readline.parseInt)
  b: seq[int] = mapIt(0..n, stdin.readline.parseInt)
  mods = 10 ^ 9 + 7
var ans = 0
for i in 0..n:
  for j in 0..(n - i):
    ans += a[i] * b[j]
    ans = ans mod mods
echo ans