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;
    ll ans = 0;
    ans+=(abs(a-b)+((a+b)%2==0))*(2*min(a,b)+1);
    ll now = 2*min(a,b)-1;
    const ll MOD = 1e9+7;
    ans %= MOD;
    // std::cout << ans << std::endl;
    ans+=(now+1)*(now+1)/2;
    std::cout << ans%MOD << std::endl;
}