#include <bits/stdc++.h>
using namespace std;
typedef int64_t ll;


void solve() {
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  ll x,y;
  cin>>x>>y;
  deque<tuple<ll,ll,ll>> que;
  que.push_back(make_tuple(0,0,0));
  while(!que.empty()){
    auto [a,b,c]=que.front();
    que.pop_front();
    if(a==x&&b==y){
      cout<<"YES"<<endl;
      return;
    }
    if(c!=3){
      que.push_back(make_tuple(a-2,b-1,c+1));
      que.push_back(make_tuple(a-1,b-2,c+1));
      que.push_back(make_tuple(a+1,b+2,c+1));
      que.push_back(make_tuple(a+2,b+1,c+1));
      que.push_back(make_tuple(a-2,b+1,c+1));
      que.push_back(make_tuple(a-1,b+2,c+1));
      que.push_back(make_tuple(a+1,b-2,c+1));
      que.push_back(make_tuple(a+2,b-1,c+1));
    }
  }
  cout<<"NO"<<endl;
} 

int main() { solve();system("pause"); }