#include <bits/stdc++.h>
using namespace std;
vector<int> dx = {0, 2, 1, 2, 1, -2, -1, -2, -1};
vector<int> dy = {0, 1, 2, -1, -2, 1, 2, -1, -2};
int main(){
  int X, Y;
  cin >> X >> Y;
  for (int i = 0; i < 9; i++){
    for (int j = 0; j < 9; j++){
      for (int k = 0; k < 9; k++){
        if (X == dx[i] + dx[j] + dx[k] && Y == dy[i] + dy[j] + dy[k]){
          cout << "YES" << endl;
          return 0;
        }
      }
    }
  }
  cout << "NO" << endl;
}