#include<cstdio>
#include<iostream>
#include<algorithm>
#include<string>
#include<queue>
#include<vector>
#include<functional>
#include<cmath>
#include<map>
#include<stack>
#include<set>
#include<numeric>
#include<limits>

using namespace std;
typedef long long ll;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<ll, string> pls;

int dx[8] = { -2,-2,-1,-1,1,1,2,2 };
int dy[8] = {-1,1,-2,2,-2,2,-1,1};

queue<pair<pair<ll, ll>,ll>> q;

int main()
{
	ll X, Y;
	cin >> X >> Y;

	q.push({{ 0,  0 }, 0});
	while (!q.empty()) {
		
		ll x = q.front().first.first;
		ll y = q.front().first.second;
		ll n = q.front().second;
		q.pop();

		for (int i = 0; i < 8; i++) {
			ll ddx = x + dx[i], ddy = y + dy[i];

			if (n < 3 && ddx == X && ddy == Y) {
				cout << "YES" << endl;
				return 0;
			}
			if (n < 3)
				q.push({ {ddx,ddy},n + 1 });
		}
	}
	cout << "NO" << endl;
	return 0;
}