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