# import pypyjit
# pypyjit.set_param("max_unroll_recursion=-1")
from collections import *
from functools import *
from itertools import *
from heapq import *
import sys, math
# sys.setrecursionlimit(10**4)
input = sys.stdin.readline


def nb(i,j):
    return [(i-2,j-1),
            (i-2,j+1),
            (i-1,j-2),
            (i-1,j+2),
            (i+2,j-1),
            (i+2,j+1),
            (i+1,j-2),
            (i+1,j+2),
            ]

v = deque()
v.append((0,0))
dist = defaultdict(lambda:-1)
dist[(0,0)] = 0
while v:
    x = v.popleft()
    if dist[x]==3:
        break
    for ix in nb(*x):
        if dist[ix]!=-1:
            continue
        dist[ix] = dist[x] + 1
        v.append(ix)

x,y = map(int,input().split())
if (x,y) in dist:
    print('YES')
else:
    print('NO')
# print(dist)