import math
import sys
def S(): return sys.stdin.readline().rstrip()
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int, sys.stdin.readline().rstrip().split())
def LI(): return list(map(int, sys.stdin.readline().rstrip().split()))
def LS(): return list(sys.stdin.readline().rstrip().split())

x, y = MI()

dx = [-2, -2, -1, -1, 1, 1, 2, 2]
dy = [-1, 1, -2, 2, -2, 2, -1, 1]

pos = set([(0, 0)])
for i in range(8):
    pos.add((dx[i], dy[i]))
for p in list(pos):
    for i in range(8):
        pos.add((p[0] + dx[i], p[1] + dy[i]))
for p in list(pos):
    for i in range(8):
        pos.add((p[0] + dx[i], p[1] + dy[i]))

if (x, y) in pos:
    print("YES")
else:
    print("NO")