import 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 = 1000000007
var
  ans: int = 0
  tmp: int = 0
for i in 0..n:
  tmp = (tmp + b[i]) mod mods
for i in 0..n:
  ans = (ans + a[i] * tmp) mod mods
  tmp = (tmp - b[n - i] + mods) mod mods
echo ans