#pragma GCC optimize("Ofast")
#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <queue>
#include <cstdio>
#include <ctime>
#include <assert.h>
#include <chrono>
#include <random>
#include <numeric>
#include <set>
#include <deque>
#include <stack>
#include <sstream>
#include <utility>
#include <cstring>
#include <unordered_map>
#include <unordered_set>
#include <tuple>
#include <array>
#include <bitset>
using namespace std;
typedef long long int ll;
typedef unsigned long long ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
    return (ull)rng() % B;
}
inline double time() {
    return static_cast<long double>(chrono::duration_cast<chrono::nanoseconds>(chrono::steady_clock::now().time_since_epoch()).count()) * 1e-9;
}

vector<int> V = {2,-2,1,-1};

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int x,y; cin >> x >> y;
    auto dfs=[&](auto dfs,int ii,int u,int v)->void{
        if(u == x and v == y){
            cout << "YES" << endl;
            exit(0);
        }
        if(ii == 3) return;
        for(int i:V){
            for(int j:V){
                if(abs(i)+abs(j) == 3){
                    dfs(dfs,ii+1,u+i,v+j);
                }
            }
        }
    };
    dfs(dfs,0,0,0);
    cout << "NO" << endl;
}