from collections import deque
def step(x,y):
    A = [(x-2,y+1),(x-2,y-1),(x-1,y+2),(x-1,y-2),(x+1,y+2),(x+1,y-2),
    (x+2,y+1),(x+2,y-1)]
    return A
A = deque([(0,0,0)])
B = [(0,0)]
while A:
    x,y,cnt = A.popleft()
    if cnt<3:
        C = step(x,y)
        cnt += 1
        B += C
        for x1,y1 in C:
            A.append((x1,y1,cnt))
B = set(B)
X,Y = map(int,input().split())
if (X,Y) in B:
    print("YES")
else:
    print("NO")