#include <iostream>
#include <type_traits>
#include <algorithm>
#include <string>
#include <vector>
#include <numeric>

// Metafunctions {{{

template <class F, class... Args>
auto is_valid_fn(F fn, Args... args) -> decltype(
    fn(args...),
    std::true_type{});

std::false_type is_valid_fn(...);

template <class F, class... Args>
struct is_valid :
  decltype(is_valid_fn(std::declval<F>(), std::declval<Args>()...)) {};

struct is_container_impl {
  template <class T>
  auto operator() (T t) -> decltype(std::begin(t));
};

template <class T>
struct is_container :
  is_valid<is_container_impl, T> {};

template <class T>
struct is_nonstring_container :
  std::integral_constant<bool,
    is_container<T>{} && !std::is_same<T, std::string>{}> {};
// }}}

// {{{ Dirty stuffs

using ll = long long;
using Z = ll;
#define rep(i, n) for (decltype(n) i = 0; i < (n); ++i)
#define rrep(i, n) for (auto i = (n); i >= 0; --i)
#define btwn(i, from, below) for (auto i = (from); i < (below); ++i)
#define rbtwn(i, from, above) for (auto i = (from); i >= (above); --i)
#define each(e, c) for (auto&& e : c)
#define all(c) std::begin(c), std::end(c)

// }}}

// Range {{{
template <class Container>
class slice_wrapper {
  public:
    using iterator = typename Container::iterator;
  private:
    Container& entity;
    iterator start, last;
  public:
    slice_wrapper(Container& container, std::size_t head, std::size_t tail) :
      entity(container),
      start(std::next(std::begin(container), head)),
      last(std::prev(std::end(container), tail)) {}
    iterator begin() const {
      return start;
    }
    iterator end() const {
      return last;
    }
};

template <class Container>
inline slice_wrapper<Container>
slice(Container& container, std::size_t head, std::size_t tail = 0) {
  return slice_wrapper<Container>(container, head, tail);
}

// }}}

// I/O utlity {{{
#define HEAD(x, ...) x
#define READ_INPUT(T, ...) T HEAD(__VA_ARGS__); read_input(__VA_ARGS__)
#define rz(...) READ_INPUT(Z, __VA_ARGS__)
#define rint(...) READ_INPUT(int, __VA_ARGS__)
#define rll(...) READ_INPUT(ll, __VA_ARGS__)
#define rstr(s) READ_INPUT(std::string, s)
#define RCONT_IMPL(c, ...) c; static_assert(is_container<decltype(c)>::value, #c " is not a container"); read_input(c, __VA_ARGS__) 
#define rcont(...) __VA_ARGS__ RCONT_IMPL
#define rvec(...) rcont(std::vector<__VA_ARGS__>)

struct is_readable_impl {
  template <class T>
  auto operator() (T t) -> decltype(std::cin >> t);
};

template <class T>
struct is_readable :
  is_valid<is_readable_impl, T> {};

template <class T>
std::enable_if_t<is_nonstring_container<T>{}>
read_input(T&, std::size_t);

template <class T, class U>
void read_input(std::pair<T, U>&);

template <class T>
std::enable_if_t<is_nonstring_container<T>{}>
read_input(T&);

template <class T>
std::enable_if_t<is_nonstring_container<T>{}>
read_input(T&, std::size_t , std::size_t, std::size_t);

template <class T>
std::enable_if_t<is_readable<T>{}>
read_input(T& value) {
  std::cin >> value;
}

template <class T>
std::enable_if_t<std::is_integral<T>{}>
read_input(T& value, T offset) {
  read_input(value);
  value -= offset;
}

template <class T>
std::enable_if_t<is_nonstring_container<T>{}>
read_input(T& container, std::size_t n) {
  container = T(n);
  read_input(container);
}

template <class T, class U>
void read_input(std::pair<T, U>& pair) {
  read_input(pair.first);
  read_input(pair.second);
}

template <class T>
std::enable_if_t<is_nonstring_container<T>{}>
read_input(T& container) {
  for (auto& elem : container)
    read_input(elem);
}

template <class T>
std::enable_if_t<is_nonstring_container<T>{}>
read_input(T& container, std::size_t n, std::size_t sentinel_l, std::size_t sentinel_r) {
  container = T(n);
  for (auto& elem : slice(container, sentinel_l, sentinel_r)) {
    read_input(elem);
  }
}

template <class T, class U>
std::ostream& operator<<(std::ostream& os, std::pair<T, U> pair) {
  os << '(' << pair.first << ", " << pair.second << ')';
  return os;
}

template <class C>
std::enable_if_t<is_nonstring_container<C>{}, std::ostream&>
operator<< (std::ostream& os, C container) {
  os << *std::begin(container);
  for (auto& elem : slice(container, 1)) {
    os << ' ' << elem;
  }
  return os;
}

void accelerate_IO() {
  std::ios_base::sync_with_stdio(false);
  std::cin.tie(nullptr);
}
// }}}

// Debugging {{{
#ifdef DEBUG
# define show(expr) std::cerr << "\e[33m[Show : line " << __LINE__ << "] " << #expr << " = " << (expr) << "\e[m" << std::endl
# define msg(message) std::cerr << "\e[33m[Message : line " << __LINE__ << "] " << message << "\e[m" << std::endl
# define debug if (true)
#else
# define show(expr)
inline void msg(...) {}
# define debug if (false)
#endif
// }}}

using namespace std;

int main() {
  constexpr Z M = 1000000007;
  accelerate_IO();
  rz(n);
  rvec(Z)(a, n + 1);
  rvec(Z)(b, n + 1);
  vector<Z> pb(n + 2);
  partial_sum(all(b), begin(pb) + 1,
      [] (Z x, Z y) { return (M + x + y) % M; });
  show(pb);
  ll sum = 0;
  rep(i, n + 1) {
    show(sum);
    sum += a[i] * pb[n - i + 1];
    sum %= M;
  }
  cout << sum << endl;
}