from copy import deepcopy
X, Y = map(int, input().split())
dx, dy= (1, 2), (2, 1)
sn = tuple((1*i, 1*j) for i in (-1, 1) for j in (-1, 1))
S = {(0, 0)}
for _ in range(3):
    for cx, cy in deepcopy(S):
        for tx, ty in zip(dx, dy):
            for sx, sy in sn:
                px = cx + tx * sx
                py = cy + ty * sy
                S.add((px, py))
print('YES' if (X, Y) in S else 'NO')