#include<bits/stdc++.h>
using namespace std;
#define fs first
#define sc second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define ALL(A) A.begin(),A.end()
#define RALL(A) A.rbegin(),A.rend()
typedef long long LL;
typedef pair<int,int> P;
const LL mod=1000000007;
const LL LINF=1LL<<60;
const int INF=1<<30;

template <class T> void multiple_transform(::std::vector<T> &a) {
    int n = a.size();
    ::std::vector<bool> sieve(n, true);
    for (int p = 2; p < n; ++p) {
        if (sieve[p]) {
            for (int k = (n - 1) / p; k != 0; --k) {
                sieve[k * p] = false;
                a[k] = (a[k] + a[k * p])%mod;
            }
        }
    }
    for (int i = 0; ++i != n;) {
        a[i] = (a[i] + a[0])%mod;
    }
}

template <class T> void inverse_multiple_transform(::std::vector<T> &a) {
    int n = a.size();
    ::std::vector<bool> sieve(n, true);
    for (int i = 0; ++i != n;) {
        a[i] = (a[i] - a[0] + mod)%mod;
    }
    for (int p = 2; p < n; ++p) {
        if (sieve[p]) {
            for (int k = 1; k * p < n; ++k) {
                sieve[k * p] = false;
                a[k] = (a[k] - a[k * p] + mod)%mod;
            }
        }
    }
}


int main(){
    LL h,w;cin >> h >> w;
    vector<LL> a(h+1),b(w+1);
    for (int i = 1; i <= h; i++) {
        a[i] = h - i;
    }
    multiple_transform(a);
    for (int i = 1; i <= w; i++) {
        b[i] = w - i;
    }
    multiple_transform(b);
    vector<LL> c(max(h,w)+1,0);
    for (int i = 1; i <= min(h,w); i++) {
        c[i] = (a[i] * b[i])%mod;
    }
    inverse_multiple_transform(c);
    cout << ((h*(w-1)%mod) + (w*(h-1) %mod) + 2 * c[1])%mod << endl;
    return 0;
}