typedef long long ll;
typedef long double ld;
#include <bits/stdc++.h>
using namespace std;
#define int long long

signed main(){
    ll a,b;
    std::cin >> a>>b;
    const ll MOD = 1e9+7;
    a%=MOD;
    b%=MOD;
    std::cout << (2*a%MOD*b%MOD+a+b+(a%2==b%2))%MOD << std::endl;
}