#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define llong long long

int main() {
    int x, y;
    cin >> x >> y;

    vector<pair<int, int>> coord;
    coord.push_back(make_pair(0, 0));
    rep(i, 3) {
        int limit = coord.size();
        rep(j, limit) {
            int posx = coord[j].first;
            int posy = coord[j].second;
            coord.push_back(make_pair(posx-1, posx-2));
            coord.push_back(make_pair(posx-2, posx-1));
            coord.push_back(make_pair(posx+1, posx-2));
            coord.push_back(make_pair(posx-2, posx+1));
            coord.push_back(make_pair(posx-1, posx+2));
            coord.push_back(make_pair(posx+2, posx-1));
            coord.push_back(make_pair(posx+1, posx+2));
            coord.push_back(make_pair(posx+2, posx+1));
        }
    }
    for(pair<int, int> a: coord) {
        if(a.first == x && a.second == y) {
            cout << "YES\n";
            return 0;
        }
    }
    cout << "NO\n";
}