#include <bits/stdc++.h>

#define rep(i, n) for (int i = 0; i < (n); i++)
#define repr(i, n) for (int i = (n) - 1; i >= 0; i--)
#define range(a) a.begin(), a.end()

using namespace std;
using ll = long long;

constexpr int MOD = 1000000007;

class mint {
  int n;
public:
  mint(int n_ = 0) : n(n_) {}
  explicit operator int() { return n; }
  friend mint operator-(mint a) { return -a.n + MOD * (a.n != 0); }
  friend mint operator+(mint a, mint b) { int x = a.n + b.n; return x - (x >= MOD) * MOD; }
  friend mint operator-(mint a, mint b) { int x = a.n - b.n; return x + (x < 0) * MOD; }
  friend mint operator*(mint a, mint b) { return (long long)a.n * b.n % MOD; }
  friend mint &operator+=(mint &a, mint b) { return a = a + b; }
  friend mint &operator-=(mint &a, mint b) { return a = a - b; }
  friend mint &operator*=(mint &a, mint b) { return a = a * b; }
  friend bool operator==(mint a, mint b) { return a.n == b.n; }
  friend bool operator!=(mint a, mint b) { return a.n != b.n; }
  friend istream &operator>>(istream &i, mint &a) { return i >> a.n; }
  friend ostream &operator<<(ostream &o, mint a) { return o << a.n; }
};
mint operator "" _m(unsigned long long n) { return n; }

vector<mint> zeta(vector<mint> f) {
  const int n = f.size();
  for (int i = 1; i < n; i++) {
    for (int j = i * 2; j < n; j += i) {
      f[i] += f[j];
    }
  }
  return f;
}

vector<mint> moebius(vector<mint> f) {
  const int n = f.size();
  for (int i = n - 1; i >= 1; i--) {
    for (int j = i * 2; j < n; j += i) {
      f[i] -= f[j];
    }
  }
  return f;
}

int main() {
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  int H, W; cin >> H >> W;
  vector<mint> f(3000001);
  vector<mint> g(3000001);
  for (int i = 1; i <= H; i++) {
    f[i] = mint(H) - i;
  }
  for (int i = 1; i <= W; i++) {
    g[i] = mint(W) - i;
  }
  f = zeta(f);
  g = zeta(g);
  for (int i = 1; i <= 3000000; i++) {
    f[i] *= g[i];
  }
  f = moebius(f);
  mint ans = f[1] * 2;
  ans += mint(H - 1) * W + mint(H) * (W - 1);
  cout << ans << endl;
}