#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}


template<typename T,T MOD = 1000000007>
struct Mint{
  static constexpr T mod = MOD;
  T v;
  Mint():v(0){}
  Mint(signed v):v(v){}
  Mint(long long t){v=t%MOD;if(v<0) v+=MOD;}

  Mint pow(long long k){
    Mint res(1),tmp(v);
    while(k){
      if(k&1) res*=tmp;
      tmp*=tmp;
      k>>=1;
    }
    return res;
  }

  static Mint add_identity(){return Mint(0);}
  static Mint mul_identity(){return Mint(1);}

  Mint inv(){return pow(MOD-2);}

  Mint& operator+=(Mint a){v+=a.v;if(v>=MOD)v-=MOD;return *this;}
  Mint& operator-=(Mint a){v+=MOD-a.v;if(v>=MOD)v-=MOD;return *this;}
  Mint& operator*=(Mint a){v=1LL*v*a.v%MOD;return *this;}
  Mint& operator/=(Mint a){return (*this)*=a.inv();}

  Mint operator+(Mint a) const{return Mint(v)+=a;};
  Mint operator-(Mint a) const{return Mint(v)-=a;};
  Mint operator*(Mint a) const{return Mint(v)*=a;};
  Mint operator/(Mint a) const{return Mint(v)/=a;};

  Mint operator-() const{return v?Mint(MOD-v):Mint(v);}

  bool operator==(const Mint a)const{return v==a.v;}
  bool operator!=(const Mint a)const{return v!=a.v;}
  bool operator <(const Mint a)const{return v <a.v;}
};
template<typename T,T MOD> constexpr T Mint<T, MOD>::mod;
template<typename T,T MOD>
ostream& operator<<(ostream &os,Mint<T, MOD> m){os<<m.v;return os;}

//INSERT ABOVE HERE
const int MAX = 3e6+100;
vector<int> D[MAX];
using M = Mint<int>;
M ys[MAX]={},xs[MAX]={};

signed main(){
  for(int i=2;i<MAX;i++)
    for(int j=i+i;j<MAX;j+=i)
      D[j].emplace_back(i);

  int h,w;
  cin>>h>>w;
  for(int i=1;i<h;i++) ys[i]=h-i;
  for(int j=1;j<w;j++) xs[j]=w-j;

  for(int x=2;x<MAX;x++){
    for(int y:D[x]){
      ys[y]+=ys[x];
      xs[y]+=xs[x];
    }
    ys[1]+=ys[x];
    xs[1]+=xs[x];
  }

  for(int i=0;i<MAX;i++) ys[i]*=xs[i];

  for(int x=MAX-1;x>=2;x--){
    for(int y:D[x]){
      ys[y]-=ys[x];
      xs[y]-=xs[x];
    }
    ys[1]-=ys[x];
    xs[1]-=xs[x];
  }

  M ans{0};
  ans+=ys[1]*M(2);
  ans+=M(h-1)*M(w);
  ans+=M(h)*M(w-1);

  cout<<ans<<endl;
  return 0;
}