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

int main()
{
	int64_t A, B;
	cin >> A >> B;
	const int64_t mod = 1000000007;
	
	int64_t ans = 0;
	if(A % 2 == B % 2)
	{
		A %= mod;
		B %= mod;
		ans += 2 * A * B + A + B + 1;
		ans %= mod;
	}
	else
	{
		A %= mod;
		B %= mod;
		ans += 2 * A * B + A + B;
		ans %= mod;
	}
	cout << ans << endl;
	return 0;
}