#include <bits/stdc++.h>
using namespace std;

int dx[] = {-2, - 2, -1, -1, 1, 1, 2, 2}, dy[] = {-1, 1, -2, 2, - 2, 2, -1, 1};
void dfs(int a, int b, int c, long long d, long long e)
{
	if(b == d && c == e) {
		cout << "YES" << endl;
		exit(0);
	}
	if(a == 3) return;
	if(a <= 2) {
		for(int i = 0; i < 8; i++) {
			dfs(a + 1, b + dx[i], c + dy[i], d, e);
		}
	}
				
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	
	long long x, y; cin >> x >> y;
	dfs(0, 0, 0, x, y);
	cout << "NO" << endl;
	
	return 0;	
}