import math
dd = [1,-1,2,-2]
x,y = list(map(int,input().split()))
a=[[0,0]]
f=False
n = 1
cnt = 1
for o in range(3):
	for i in range(n):
		for dx in dd:
			for dy in dd:
				if math.fabs(dx) == math.fabs(dy):
					continue
				a.append([a[i][0]+dx,a[i][1]+dy])
				if a[i][0]+dx == x and a[i][1]+dy == y:
					f=True
				cnt+=1
	n=cnt
if f:
	print("YES")
else:
	print("NO")