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: int = 10 ^ 9 + 7
var
  ans: int = 0
  tmp: int = 0
for i in 0..n:
  tmp += b[i]
for i in 0..n:
  ans += a[i] * tmp
  ans = ans mod mods
  tmp -= b[n - i]
echo ans