#include<iostream>
#include<algorithm>
#include<string>
#include<math.h>
#include<bitset>
#include <vector>
#include<bitset>
#include <iomanip>
#include <map>
#include <set>
#include <stack>
#include <deque>
#include <climits>
#include <queue>
using namespace std;

int main() {
	
	long long A, B;
	cin >> A >> B;
	A=A%1000000007;
	B=B%1000000007;
	if (A % 2 == B % 2)cout << (2 * A * B + A + B + 1) % 1000000007;
	else cout << (2 * A * B + A + B ) % 1000000007;


	
}