#include <bits/stdc++.h>
using namespace std;

long long a, b;
const long long M = 1e9 + 7;
bool f;

int main()
{
	cin >> a >> b;

	if ((a + b) & 1)
		f = 1;

	a %= M;
	b %= M;

	if (f) {
		if (b & 1)
			swap(a, b);

		a = (a + M - 1) % M;
		cout << ((a + 1) * (b + 1) % M + a * b % M + b * 2 % M) % M << endl;
	}
	else
		cout << ((a + 1) * (b + 1) % M + a * b % M) % M << endl;
}