b5 kirill

#include <iostream>
#include <string>
#include <sstream>
#include <cmath>
#include <algorithm>
#include <memory.h>
#include <stdio.h>
#include <vector>
#include <stack>
#include <deque>
#include <queue>
#include <vector>
#include <set>
#include <iterator>
#include <map>
#include <iomanip>
#include <unordered_set>
#include <unordered_map>
#include <assert.h>
#define int long long
#define fir first
#define sec second
#define pb push_back
#define double long double
#define all(v) (v).begin(), v.end()
#define endl "\n"
#define un unsigned
#define INF 1000000007
using namespace std;

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

    cout << ((a + b) * (a - b) + 1000007) % 1000007;

    return 0;
}