#include<iostream>
#include<cstdio>
#include<cstring>
#include <cstdlib>  
#include <cmath>   
#include<cctype>
#include<string>
#include<set>
#include<iomanip>
#include <map>
#include<algorithm>
#include <functional>
#include<vector>
#include<climits>
#include<stack>
#include<queue>
#include <deque>
#include <climits>
#include <typeinfo>
#include <utility> 
#define all(x) (x).begin(),(x).end()
#define rep(i,m,n) for(int i = m;i < n;++i)
#define pb push_back
#define fore(i,a) for(auto &i:a)
#define rrep(i,m,n) for(int i = m;i >= n;--i)
#define INF INT_MAX/2
using namespace std;
using ll = long long;
using R = double;
using Data = pair<ll, vector<int>>;
const ll MOD = 1e9 + 7;
const ll inf = 1LL << 50;
struct edge { ll from; ll to; ll cost; };

set<pair<int, int>>able;

void dfs(int x,int y,int n){
	if (n == 4)return;
	able.insert({x,y});
	
	int dx[4] = {-2,2,-1,1};
	int dy[4] = {-2,2,-1,1};

	rep(i, 0, 4) {
		if (i == 0 || i == 1) {
			rep(j, 2, 4)dfs(x + dx[i], y + dy[j], n + 1);
		}
		if(i == 2 || i == 3){
			rep(j, 0, 3)dfs(x + dx[i], y + dy[j], n + 1);
		}
	}

}


int main() {
	int x, y;
	cin >> x >> y;
	dfs(0, 0, 0);
	if (able.count({x,y})!=0)cout << "YES" << endl;
	else cout << "NO" << endl;
	return 0;
}