#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef int64_t lint;
#define rep(i, n) for(int i=0; i<n; i++)
#define repx(i, l, n) for(int i=l; i<n; i++)
#define all(v) v.begin(), v.end()
#define show(x) cout << #x << ": " << x << endl;
#define list(x) cout << #x << ": " << x << "  ";
#define pb push_back
using vi = vector<lint>;
using vvi = vector<vector<lint>>;
template<class T> inline void vin(vector<T>& v) { rep(i, v.size()) cin >> v.at(i); }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<class T> inline void drop(T x) { cout << x << endl; exit(0); }
template<class T> void vout(vector<T> v) { rep(i, v.size()) { cout << v.at(i) << ' '; } cout << endl; }
constexpr lint LINF = LLONG_MAX/2;
using mint = modint1000000007;
using vm = vector<mint>;

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

	mint a=0, b=0, c=0;
	if (A < B) swap(A, B);
	if (A+B == 0) drop(1);
	lint x, y, z;
	x = (A+B)/2;
	y = (B-A)/2;
	a = x-y+1;
	z = (-A-B)/2;
	// show(x)
	// show(y)
	// show(z)
	b = y-z+1;
	c = a*b;
	// show(c.val())
	x = (A+B-1)/2;
	y = (B-A-1)/2;
	a = x-y+1;
	z = (-A-B+1)/2;
	// show(x)
	// show(y)
	// show(z)
	b = y-z+1;
	c += a*b;
	std::cout << c.val() << '\n';
}