#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <sstream>
#include <cstdio>
#include <cstdlib>

using namespace std;

vector<long long int> mapx;
vector<long long int> mapy;

void update(vector<long long int>& mx, vector<long long int>& my, long long int x, long long int y, long long int layer){
    if(layer <= 0){
        return;
    }

    mx.push_back(x);
    my.push_back(y);

    mx.push_back(x+2);
    my.push_back(y+1);
    update(mx, my, x+2, y+1, layer-1);
    mx.push_back(x+1);
    my.push_back(y+2);    
    update(mx, my, x+1, y+2, layer-1);
    mx.push_back(x+2);
    my.push_back(y-1);
    update(mx, my, x+2, y-1, layer-1);
    mx.push_back(x+1);
    my.push_back(y-2);
    update(mx, my, x+1, y-2, layer-1);
    mx.push_back(x-2);
    my.push_back(y+1);
    update(mx, my, x-2, y+1, layer-1);
    mx.push_back(x-1);
    my.push_back(y+2);
    update(mx, my, x-1, y+2, layer-1);
    mx.push_back(x-2);
    my.push_back(y-1);
    update(mx, my, x-2, y-1, layer-1);
    mx.push_back(x-1);
    my.push_back(y-2);
    update(mx, my, x-1, y-2, layer-1);
}

int main(){
    //long long int ax =0, ay=0;
    mapx.push_back(0);
    mapx.push_back(0);
    update(mapx, mapy, 0, 0, 3);
    long long int x, y;
    cin >> x >> y;
    bool ans = false;
    for (long long int i = 0; i < mapx.size(); i += 1)
    {
        if(x+mapx[i] == 0 and y+mapy[i]==0)
            ans = true;
        //cout << mapx[i] << " , " << mapy[i] << endl;
    }
    if(ans){
        cout << "YES" << endl;
    }else {
        cout << "NO" << endl;
    }
 
    return 0;
}