#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES

#ifdef _MSC_VER
#include "bits\stdc++.h"
#else
#include <bits/stdc++.h>
#endif
#include <vector>
#include <set>
#include <string>
#include <queue>
#include <list>
#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)
// #define rep(i,n) REP(i,1,n)
#define ll long long
#define ull unsigned ll
typedef long double ld;
#define SQR(X)  ( (X)*(X) )
#define CUBE(X) ( (X)*(X)*(X) )

// #define int ll

using namespace std;

struct Zahyou{
  int x,y,cnt;
};

signed main() {
  int i,j,k,l;
  int dx[] = {-2,-2,-1,-1,+1,+1,+2,+2};
  int dy[] = {-1,+1,-2,+2,-2,+2,-1,+1};
  int x,y;
  bool YES = false;
  cin >> x >> y;
  queue<Zahyou> q;
  Zahyou start = {0,0,0};
  q.push(start);
  while (q.size()) {
    Zahyou now = q.front(); q.pop();
    if(x == now.x && y == now.y) {
      YES = true; break;
    }
    if(now.cnt < 3) {
      for(i=0;i<8;i++) {
        Zahyou next = now;
        next.x += dx[i];
        next.y += dy[i];
        next.cnt++;
        q.push(next);
      }
    }
  }
  if(YES) puts("YES");
  else puts("NO");
  return 0;
}