#include<iostream>
#include<string>
#include<cstdio>
#include<vector>
#include<cmath>
#include<algorithm>
#include<functional>
#include<iomanip>
#include<queue>
#include<ciso646>
#include<random>
#include<map>
#include<set>
#include<complex>
#include<bitset>
#include<stack>
#include<unordered_map>
#include<utility>
#include<tuple>
using namespace std;
typedef long long ll;
typedef unsigned int ui;
const ll mod = 1000000007;
const ll INF = (ll)1000000007 * 1000000007;
typedef pair<int, int> P;
#define stop char nyaa;cin>>nyaa;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define Rep(i,sta,n) for(int i=sta;i<n;i++)
#define Per(i,sta,n) for(int i=n-1;i>=sta;i--)
#define rep1(i,n) for(int i=1;i<=n;i++)
#define per1(i,n) for(int i=n;i>=1;i--)
#define Rep1(i,sta,n) for(int i=sta;i<=n;i++)
typedef long double ld;
typedef complex<ld> Point;
const ld eps = 1e-8;
const ld pi = acos(-1.0);
typedef pair<ll, ll> LP;

int h,w;
int n;
vector<ll> a,b,c,prime;

void solve(){
    cin >> h >> w;
    n=max(h,w);
    vector<bool> isprime(n,true);
    Rep(i,2,n+1){
        if (!isprime[i]) continue;
        prime.push_back(i);
        //cout << i << endl;
        Rep(k,2,n+1){
            if(k*i>n) break;
            isprime[k*i]=false;
        }
    }
    rep(i,n+1){
        a.push_back(max(h-i,0));
        b.push_back(max(w-i,0));
    }
    for(auto p:prime){
        per(i,n+1){
            if(i*p>n) continue;
            a[i]+=a[i*p];
            b[i]+=b[i*p];
            a[i]%=mod;
            b[i]%=mod;
        }
    }
    rep(i,n+1){
        //cout << i << " " << a[i] << " " << b[i] << endl;
        c.push_back(a[i]*b[i]%mod);
    }
    for(auto p:prime){
        rep(i,n+1){
            if(i*p>n) continue;
            c[i]-=c[i*p];
            c[i]+=mod;
            c[i]%=mod;
        }
    }
    cout << (2*c[1]+h*(w-1)+w*(h-1))%mod << endl;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << fixed << setprecision(50);
    solve();
}