#include <bits/stdc++.h>

using namespace std;

using ll = long long;

const int MOD = 1e9 + 7;

struct mint {
  using ull = unsigned long long;
  ull a;

  constexpr mint(const ull x = 0) noexcept : a(x % MOD) {}
  constexpr mint operator+(const mint rhs) const noexcept {
    return mint(*this) += rhs;
  }
  constexpr mint operator-(const mint rhs) const noexcept {
    return mint(*this) -= rhs;
  }
  constexpr mint operator*(const mint rhs) const noexcept {
    return mint(*this) *= rhs;
  }
  constexpr mint operator/(const mint rhs) const noexcept {
    return mint(*this) /= rhs;
  }
  constexpr mint &operator+=(const mint rhs) noexcept {
    a += rhs.a;
    if (a >= MOD) a -= MOD;
    return *this;
  }
  constexpr mint &operator-=(const mint rhs) noexcept {
    if (a < rhs.a)a += MOD;
    a -= rhs.a;
    return *this;
  }
  constexpr mint &operator*=(const mint rhs) noexcept {
    a = a * rhs.a % MOD;
    return *this;
  }
  constexpr mint &operator/=(mint rhs) noexcept {
    ull exp = MOD - 2;
    while (exp) {
      if (exp % 2) *this *= rhs;
      rhs *= rhs;
      exp /= 2;
    }
    return *this;
  }
  constexpr mint pow(const mint &a, ull n) noexcept {
    if (n == 0) return 1;
    auto t = pow(a, n / 2);
    t = t * t;
    if (n & 1) t = t * a;
    return t;
  }
};

int main(void) {
  ll A, B;
  scanf("%lld %lld", &A, &B);

  mint x = A, y = B;
  mint ans = x * y * 2 + x + y + 1;

  if (A % 2 == B % 2) printf("%lld\n", ans.a);
  else printf("%lld\n", (ans - 1).a);

  return 0;
}