#include<iostream>
#include<vector>

int main() {
	int gx, gy;
	std::cin >> gx >> gy;
	if (0 == gx && 0 == gy) {
		std::cout << "YES" << std::endl;
		return 0;
	}

	std::vector<std::pair<int, int> > v;
	v.push_back(std::make_pair(0, 0));
	for (int j = 0; j < 3; j++){
		int size = v.size();
		for (int i = 0; i < size; i++) {
			v.push_back(std::make_pair(v[i].first - 2, v[i].second - 1));
			v.push_back(std::make_pair(v[i].first - 2, v[i].second + 1));
			v.push_back(std::make_pair(v[i].first - 1, v[i].second - 2));
			v.push_back(std::make_pair(v[i].first - 1, v[i].second + 2));
			v.push_back(std::make_pair(v[i].first + 1, v[i].second - 2));
			v.push_back(std::make_pair(v[i].first + 1, v[i].second + 2));
			v.push_back(std::make_pair(v[i].first + 2, v[i].second - 1));
			v.push_back(std::make_pair(v[i].first + 2, v[i].second + 1));
		}
	}

	for (int i = 0; i < v.size(); i++) {
		if(v[i].first == gx && v[i].second == gy){
			std::cout << "YES" << std::endl;
			return 0;
		}
	}

	std::cout << "NO" << std::endl;

	return 0;
}