x,y = map(int,input().split())
move = []
for i in [-1,1]:
    for j in [-2,2]:
        move += [(i,j),(j,i)]
d = {(0,0):0}
from collections import deque
q = deque()
q.append((0,0))
while q:
    a,b = q.popleft()
    x = d[a,b]
    if x >= 3: continue
    for i,j in move:
        na, nb = a+i, b+j
        if (na,nb) not in d:
            d[na,nb] = x+1
            if x <= 2:
                q.append((na,nb))
print("YES" if (x,y) in d else "NO")