#include <bits/stdc++.h>
using namespace std;

using i8 = int8_t;using i16 = int16_t;using i32 = int32_t;using i64 = int64_t;using i128 = __int128_t;using u8 = uint8_t;using u16 = uint16_t;using u32 = uint32_t;using u64 = uint64_t;using u128 = __uint128_t;using f32 = float;using f64 = double;using f80 = long double;
using vi32 = vector<i32>;using vi64 = vector<i64>;using vu32 = vector<u32>;using vu64 = vector<u64>;
using vvi32 = vector<vector<int32_t>>;using vvi64 = vector<vector<int64_t>>;using vvu32 = vector<vector<uint32_t>>;using vvu64 = vector<vector<uint64_t>>;
using pi32 = pair<i32,i32>;using pi64 = pair<i64,i64>;using pu32 = pair<u32,u32>;using pu64 = pair<u64,u64>;
using vpi32 = vector<pi32>;using vpi64 = vector<pi64>;using vpu32 = vector<pu32>;using vpu64 = vector<pu64>;

const i64 Mod = 1e9+7;

int main() {
  i64 n;
  scanf("%ld", &n);
  n++;
  vi64 a(n), b(n+1);
  for (int i = 0; i < n; i++) scanf("%ld", &a[i]);
  for (int i = 0; i < n; i++) {
    i64 x;
    scanf("%ld", &x);
    b[i+1] = b[i] + x;
    b[i+1] %= Mod;
  }
  i64 ans = 0;
  for (int i = 0; i < n; i++) {
    ans += (b[n - i] * a[i]) % Mod;
    ans %= Mod;
  }
  printf("%ld\n", ans);
  return 0;
}