X, Y = map(int, input().split())
dx = [-2, -2, -1, -1, 1, 1, 2, 2]
dy = [-1, 1, -2, 2, -2, 2, -1, 1]
can = [set() for i in range(4)]
can[0].add((0, 0))
for i in range(1, 4):
    for x, y in can[i - 1]:
        for d in range(8):
            can[i].add((x + dx[d], y + dy[d]))

if (X, Y) in can[0] or (X, Y) in can[1] or (X, Y) in can[2] or (X, Y) in can[3]:
    print("YES")
else:
    print("NO")