import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

import itertools

X,Y = map(int,read().split())

dxs = [0,2,1,-1,-2,-2,-1,1,2]
dys = [0,1,2,2,1,-1,-2,-2,-1]

se = set([(0,0)])
for _ in range(3):
    se = set((x+dx,y+dy) for (x,y),(dx,dy) in itertools.product(se, zip(dxs, dys)))

answer = 'YES' if (X,Y) in se else 'NO'
print(answer)