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

int main()
{
	long long A, B;
	cin >> A >> B;

	const long long MOD = 1000000000 + 7;
	int same = 0;
	if( A % 2 == B % 2 ) same = 1;
	A %= MOD;
	B %= MOD;
	long long ans = A * (B + 1) % MOD + B * (A + 1) % MOD;
	if( same ) ans = (A + 1) * (B + 1) % MOD + A * B % MOD;
	ans %= MOD;

	cout << ans << endl;
}